diff --git a/src/Mod/Fem/App/FemConstraintPressure.cpp b/src/Mod/Fem/App/FemConstraintPressure.cpp
index 5381846f52..e6a06c4efb 100644
--- a/src/Mod/Fem/App/FemConstraintPressure.cpp
+++ b/src/Mod/Fem/App/FemConstraintPressure.cpp
@@ -58,6 +58,21 @@ const char* ConstraintPressure::getViewProviderName() const
     return "FemGui::ViewProviderFemConstraintPressure";
 }
 
+void ConstraintPressure::handleChangedPropertyType(Base::XMLReader& reader,
+                                                   const char* TypeName,
+                                                   App::Property* prop)
+{
+    // property Pressure had App::PropertyFloat and was changed to App::PropertyPressure
+    if (prop == &Pressure && strcmp(TypeName, "App::PropertyFloat") == 0) {
+        App::PropertyFloat PressureProperty;
+        // restore the PropertyFloat to be able to set its value
+        PressureProperty.Restore(reader);
+        // the old implementation or pressure stored the value as MPa
+        // therefore we must convert the value with a factor 1000
+        Pressure.setValue(PressureProperty.getValue() * 1000.0);
+    }
+}
+
 void ConstraintPressure::onChanged(const App::Property* prop)
 {
     Constraint::onChanged(prop);
diff --git a/src/Mod/Fem/App/FemConstraintPressure.h b/src/Mod/Fem/App/FemConstraintPressure.h
index 7ebb3ca754..1bb67410f6 100644
--- a/src/Mod/Fem/App/FemConstraintPressure.h
+++ b/src/Mod/Fem/App/FemConstraintPressure.h
@@ -37,7 +37,7 @@ class FemExport ConstraintPressure: public Fem::Constraint
 public:
     ConstraintPressure();
 
-    App::PropertyFloat Pressure;
+    App::PropertyPressure Pressure;
     App::PropertyBool Reversed;
     App::PropertyVectorList Points;
     App::PropertyVectorList Normals;
@@ -49,6 +49,8 @@ public:
     const char* getViewProviderName() const override;
 
 protected:
+    void
+    handleChangedPropertyType(Base::XMLReader& reader, const char* TypeName, App::Property* prop);
     void onChanged(const App::Property* prop) override;
 };
 
diff --git a/src/Mod/Fem/Gui/TaskFemConstraintPressure.cpp b/src/Mod/Fem/Gui/TaskFemConstraintPressure.cpp
index dec2df4f65..7cfe607d7f 100644
--- a/src/Mod/Fem/Gui/TaskFemConstraintPressure.cpp
+++ b/src/Mod/Fem/Gui/TaskFemConstraintPressure.cpp
@@ -52,6 +52,33 @@ TaskFemConstraintPressure::TaskFemConstraintPressure(
     ui->setupUi(proxy);
     QMetaObject::connectSlotsByName(this);
 
+    this->groupLayout()->addWidget(proxy);
+
+    // Get the feature data
+    Fem::ConstraintPressure* pcConstraint =
+        static_cast<Fem::ConstraintPressure*>(ConstraintView->getObject());
+
+    std::vector<App::DocumentObject*> Objects = pcConstraint->References.getValues();
+    std::vector<std::string> SubElements = pcConstraint->References.getSubValues();
+
+    // Fill data into dialog elements
+    ui->if_pressure->setUnit(pcConstraint->Pressure.getUnit());
+    ui->if_pressure->setMinimum(0);
+    ui->if_pressure->setMaximum(FLOAT_MAX);
+    ui->if_pressure->setValue(pcConstraint->Pressure.getQuantityValue());
+    ui->if_pressure->bind(pcConstraint->Pressure);
+
+    bool reversed = pcConstraint->Reversed.getValue();
+    ui->checkBoxReverse->setChecked(reversed);
+
+    ui->lw_references->clear();
+    for (std::size_t i = 0; i < Objects.size(); i++) {
+        ui->lw_references->addItem(makeRefText(Objects[i], SubElements[i]));
+    }
+    if (!Objects.empty()) {
+        ui->lw_references->setCurrentRow(0, QItemSelectionModel::ClearAndSelect);
+    }
+
     // create a context menu for the listview of the references
     createDeleteAction(ui->lw_references);
     connect(deleteAction,
@@ -72,37 +99,9 @@ TaskFemConstraintPressure::TaskFemConstraintPressure(
             this,
             &TaskFemConstraintPressure::onCheckReverse);
 
-    this->groupLayout()->addWidget(proxy);
-
-    /* Note: */
-    // Get the feature data
-    Fem::ConstraintPressure* pcConstraint =
-        static_cast<Fem::ConstraintPressure*>(ConstraintView->getObject());
-
-    std::vector<App::DocumentObject*> Objects = pcConstraint->References.getValues();
-    std::vector<std::string> SubElements = pcConstraint->References.getSubValues();
-
-    // Fill data into dialog elements
-    ui->if_pressure->setMinimum(0);
-    ui->if_pressure->setMaximum(FLOAT_MAX);
-    Base::Quantity p =
-        Base::Quantity(1000 * (pcConstraint->Pressure.getValue()), Base::Unit::Stress);
-    ui->if_pressure->setValue(p);
-    bool reversed = pcConstraint->Reversed.getValue();
-    ui->checkBoxReverse->setChecked(reversed);
-    /* */
-
-    ui->lw_references->clear();
-    for (std::size_t i = 0; i < Objects.size(); i++) {
-        ui->lw_references->addItem(makeRefText(Objects[i], SubElements[i]));
-    }
-    if (!Objects.empty()) {
-        ui->lw_references->setCurrentRow(0, QItemSelectionModel::ClearAndSelect);
-    }
-
     // Selection buttons
-    buttonGroup->addButton(ui->btnAdd, (int)SelectionChangeModes::refAdd);
-    buttonGroup->addButton(ui->btnRemove, (int)SelectionChangeModes::refRemove);
+    buttonGroup->addButton(ui->btnAdd, static_cast<int>(SelectionChangeModes::refAdd));
+    buttonGroup->addButton(ui->btnRemove, static_cast<int>(SelectionChangeModes::refRemove));
 
     updateUI();
 }
@@ -252,15 +251,12 @@ const std::string TaskFemConstraintPressure::getReferences() const
     return TaskFemConstraint::getReferences(items);
 }
 
-/* Note: */
-double TaskFemConstraintPressure::get_Pressure() const
+std::string TaskFemConstraintPressure::getPressure() const
 {
-    Base::Quantity pressure = ui->if_pressure->getQuantity();
-    double pressure_in_MPa = pressure.getValueAs(Base::Quantity::MegaPascal);
-    return pressure_in_MPa;
+    return ui->if_pressure->value().getSafeUserString().toStdString();
 }
 
-bool TaskFemConstraintPressure::get_Reverse() const
+bool TaskFemConstraintPressure::getReverse() const
 {
     return ui->checkBoxReverse->isChecked();
 }
@@ -323,13 +319,13 @@ bool TaskDlgFemConstraintPressure::accept()
 
     try {
         Gui::Command::doCommand(Gui::Command::Doc,
-                                "App.ActiveDocument.%s.Pressure = %f",
+                                "App.ActiveDocument.%s.Pressure = \"%s\"",
                                 name.c_str(),
-                                parameterPressure->get_Pressure());
+                                parameterPressure->getPressure().c_str());
         Gui::Command::doCommand(Gui::Command::Doc,
                                 "App.ActiveDocument.%s.Reversed = %s",
                                 name.c_str(),
-                                parameterPressure->get_Reverse() ? "True" : "False");
+                                parameterPressure->getReverse() ? "True" : "False");
         std::string scale = parameterPressure->getScale();  // OvG: determine modified scale
         Gui::Command::doCommand(Gui::Command::Doc,
                                 "App.ActiveDocument.%s.Scale = %s",
diff --git a/src/Mod/Fem/Gui/TaskFemConstraintPressure.h b/src/Mod/Fem/Gui/TaskFemConstraintPressure.h
index d540829388..c312290534 100644
--- a/src/Mod/Fem/Gui/TaskFemConstraintPressure.h
+++ b/src/Mod/Fem/Gui/TaskFemConstraintPressure.h
@@ -46,8 +46,8 @@ public:
                                        QWidget* parent = nullptr);
     ~TaskFemConstraintPressure() override;
     const std::string getReferences() const override;
-    double get_Pressure() const;
-    bool get_Reverse() const;
+    std::string getPressure() const;
+    bool getReverse() const;
 
 private Q_SLOTS:
     void onReferenceDeleted();
diff --git a/src/Mod/Fem/Gui/TaskFemConstraintPressure.ui b/src/Mod/Fem/Gui/TaskFemConstraintPressure.ui
index fbe97414c9..b3e9ff5200 100644
--- a/src/Mod/Fem/Gui/TaskFemConstraintPressure.ui
+++ b/src/Mod/Fem/Gui/TaskFemConstraintPressure.ui
@@ -70,12 +70,12 @@
       </widget>
      </item>
      <item>
-      <widget class="Gui::InputField" name="if_pressure">
-       <property name="text">
-        <string>0 MPa</string>
-       </property>
+      <widget class="Gui::QuantitySpinBox" name="if_pressure">
        <property name="unit" stdset="0">
-        <string notr="true">MPa</string>
+        <string notr="true"/>
+       </property>
+       <property name="minimum">
+        <double>0.000000000000000</double>
        </property>
       </widget>
      </item>
@@ -92,9 +92,9 @@
  </widget>
  <customwidgets>
   <customwidget>
-   <class>Gui::InputField</class>
-   <extends>QLineEdit</extends>
-   <header>Gui/InputField.h</header>
+   <class>Gui::QuantitySpinBox</class>
+   <extends>QWidget</extends>
+   <header>Gui/QuantitySpinBox.h</header>
   </customwidget>
  </customwidgets>
  <resources/>
diff --git a/src/Mod/Fem/femexamples/boxanalysis_static.py b/src/Mod/Fem/femexamples/boxanalysis_static.py
index 5f78080494..cb1651f4b7 100644
--- a/src/Mod/Fem/femexamples/boxanalysis_static.py
+++ b/src/Mod/Fem/femexamples/boxanalysis_static.py
@@ -111,7 +111,7 @@ def setup(doc=None, solvertype="ccxtools"):
     # constraint pressure
     con_pressure = ObjectsFem.makeConstraintPressure(doc, name="FemConstraintPressure")
     con_pressure.References = [(geom_obj, "Face2")]
-    con_pressure.Pressure = 1000.0
+    con_pressure.Pressure = "1000.0 MPa"
     con_pressure.Reversed = False
     analysis.addObject(con_pressure)
 
diff --git a/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py b/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py
index bded5f11c4..c3efe9b189 100644
--- a/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py
+++ b/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py
@@ -167,7 +167,7 @@ def setup(doc=None, solvertype="ccxtools"):
     # constraint pressure
     con_pressure = ObjectsFem.makeConstraintPressure(doc, "ConstraintPressure")
     con_pressure.References = [(geom_obj, "Face10")]
-    con_pressure.Pressure = 100.0  # Pa ? = 100 Mpa ?
+    con_pressure.Pressure = "100.0 MPa"
     con_pressure.Reversed = False
     analysis.addObject(con_pressure)
 
diff --git a/src/Mod/Fem/femexamples/constraint_section_print.py b/src/Mod/Fem/femexamples/constraint_section_print.py
index ace65d6365..4ccf5da6e9 100644
--- a/src/Mod/Fem/femexamples/constraint_section_print.py
+++ b/src/Mod/Fem/femexamples/constraint_section_print.py
@@ -257,7 +257,7 @@ def setup(doc=None, solvertype="ccxtools"):
     # constraint pressure
     con_pressure = ObjectsFem.makeConstraintPressure(doc, "ConstraintPressure")
     con_pressure.References = [(geom_obj, "Face1")]
-    con_pressure.Pressure = 100.0
+    con_pressure.Pressure = "100.0 MPa"
     con_pressure.Reversed = False
     analysis.addObject(con_pressure)
 
diff --git a/src/Mod/Fem/femexamples/constraint_transform_beam_hinged.py b/src/Mod/Fem/femexamples/constraint_transform_beam_hinged.py
index 1d8bd5cbb7..22c9d136b8 100644
--- a/src/Mod/Fem/femexamples/constraint_transform_beam_hinged.py
+++ b/src/Mod/Fem/femexamples/constraint_transform_beam_hinged.py
@@ -147,7 +147,7 @@ def setup(doc=None, solvertype="ccxtools"):
     # constraint pressure
     con_pressure = ObjectsFem.makeConstraintPressure(doc, name="FemConstraintPressure")
     con_pressure.References = [(geom_obj, "Face8")]
-    con_pressure.Pressure = 10.0
+    con_pressure.Pressure = "10.0 MPa"
     con_pressure.Reversed = False
     analysis.addObject(con_pressure)
 
diff --git a/src/Mod/Fem/femexamples/material_multiple_tensionrod_twoboxes.py b/src/Mod/Fem/femexamples/material_multiple_tensionrod_twoboxes.py
index f60fa1f4ba..d0a252f49e 100644
--- a/src/Mod/Fem/femexamples/material_multiple_tensionrod_twoboxes.py
+++ b/src/Mod/Fem/femexamples/material_multiple_tensionrod_twoboxes.py
@@ -153,7 +153,7 @@ def setup(doc=None, solvertype="ccxtools"):
     # constraint pressure
     con_pressure = ObjectsFem.makeConstraintPressure(doc, "ConstraintPressure")
     con_pressure.References = [(geom_obj, "Face11")]
-    con_pressure.Pressure = 1000.0
+    con_pressure.Pressure = "1000.0 MPa"
     con_pressure.Reversed = False
     analysis.addObject(con_pressure)
 
diff --git a/src/Mod/Fem/femexamples/material_nl_platewithhole.py b/src/Mod/Fem/femexamples/material_nl_platewithhole.py
index 9a727b7c50..1546539b74 100644
--- a/src/Mod/Fem/femexamples/material_nl_platewithhole.py
+++ b/src/Mod/Fem/femexamples/material_nl_platewithhole.py
@@ -161,7 +161,7 @@ def setup(doc=None, solvertype="ccxtools"):
     # pressure constraint
     con_pressure = ObjectsFem.makeConstraintPressure(doc, "ConstraintPressure")
     con_pressure.References = [(geom_obj, "Face2")]
-    con_pressure.Pressure = 130.0
+    con_pressure.Pressure = "130.0 MPa"
     con_pressure.Reversed = True
     analysis.addObject(con_pressure)
 
diff --git a/src/Mod/Fem/femobjects/constraint_initialpressure.py b/src/Mod/Fem/femobjects/constraint_initialpressure.py
index 2b2914eb4d..c28297fe55 100644
--- a/src/Mod/Fem/femobjects/constraint_initialpressure.py
+++ b/src/Mod/Fem/femobjects/constraint_initialpressure.py
@@ -51,5 +51,5 @@ class ConstraintInitialPressure(base_fempythonobject.BaseFemPythonObject):
                 "Parameter",
                 "Initial Pressure"
             )
-            # App::PropertyPressure is in kPa and we initialize 1 bar
-            obj.Pressure = 100
+            # we initialize 1 bar
+            obj.Pressure = "100 kPa"
diff --git a/src/Mod/Fem/femsolver/calculix/write_constraint_pressure.py b/src/Mod/Fem/femsolver/calculix/write_constraint_pressure.py
index e1bb23b696..18aee620b0 100644
--- a/src/Mod/Fem/femsolver/calculix/write_constraint_pressure.py
+++ b/src/Mod/Fem/femsolver/calculix/write_constraint_pressure.py
@@ -25,6 +25,7 @@ __title__ = "FreeCAD FEM calculix constraint pressure"
 __author__ = "Bernd Hahnebach"
 __url__ = "https://www.freecad.org"
 
+import FreeCAD
 
 def get_analysis_types():
     return ["buckling", "static", "thermomech"]
@@ -47,7 +48,9 @@ def write_meshdata_constraint(f, femobj, prs_obj, ccxwriter):
     # floats read from ccx should use {:.13G}, see comment in writer module
 
     rev = -1 if prs_obj.Reversed else 1
-    press_rev = rev * prs_obj.Pressure
+    # the pressure has to be output in MPa
+    pressure_quantity = FreeCAD.Units.Quantity(prs_obj.Pressure.getValueAs("MPa"))
+    press_rev = rev * pressure_quantity
 
     f.write("*DLOAD\n")
     for ref_shape in femobj["PressureFaces"]:
@@ -57,12 +60,12 @@ def write_meshdata_constraint(f, femobj, prs_obj, ccxwriter):
         f.write("** " + ref_shape[0] + "\n")
         for face, fno in ref_shape[1]:
             if fno > 0:  # solid mesh face
-                f.write("{},P{},{:.13G}\n".format(face, fno, press_rev))
+                f.write("{},P{},{}\n".format(face, fno, press_rev))
             # on shell mesh face: fno == 0
             # normal of element face == face normal
             elif fno == 0:
-                f.write("{},P,{:.13G}\n".format(face, press_rev))
+                f.write("{},P,{}\n".format(face, press_rev))
             # on shell mesh face: fno == -1
             # normal of element face opposite direction face normal
             elif fno == -1:
-                f.write("{},P,{:.13G}\n".format(face, -1 * press_rev))
+                f.write("{},P,{}\n".format(face, -1 * press_rev))
diff --git a/src/Mod/Fem/femsolver/elmer/equations/deformation_writer.py b/src/Mod/Fem/femsolver/elmer/equations/deformation_writer.py
index ef50ec7da6..295a9a9a38 100644
--- a/src/Mod/Fem/femsolver/elmer/equations/deformation_writer.py
+++ b/src/Mod/Fem/femsolver/elmer/equations/deformation_writer.py
@@ -82,7 +82,7 @@ class DeformationWriter:
         for obj in self.write.getMember("Fem::ConstraintPressure"):
             if obj.References:
                 for name in obj.References[0][1]:
-                    pressure = self.write.getFromUi(obj.Pressure, "MPa", "M/(L*T^2)")
+                    pressure = float(obj.Pressure.getValueAs("Pa"))
                     if not obj.Reversed:
                         pressure *= -1
                     self.write.boundary(name, "Normal Force", pressure)
diff --git a/src/Mod/Fem/femsolver/elmer/equations/elasticity_writer.py b/src/Mod/Fem/femsolver/elmer/equations/elasticity_writer.py
index 2e52062b32..60c5327504 100644
--- a/src/Mod/Fem/femsolver/elmer/equations/elasticity_writer.py
+++ b/src/Mod/Fem/femsolver/elmer/equations/elasticity_writer.py
@@ -298,7 +298,7 @@ class ElasticityWriter:
         for obj in self.write.getMember("Fem::ConstraintPressure"):
             if obj.References:
                 for name in obj.References[0][1]:
-                    pressure = self.write.getFromUi(obj.Pressure, "MPa", "M/(L*T^2)")
+                    pressure = float(obj.Pressure.getValueAs("Pa"))
                     if not obj.Reversed:
                         pressure *= -1
                     self.write.boundary(name, "Normal Force", pressure)
diff --git a/src/Mod/Fem/femsolver/elmer/equations/flow_writer.py b/src/Mod/Fem/femsolver/elmer/equations/flow_writer.py
index 8649ba4a84..c19451bb4b 100644
--- a/src/Mod/Fem/femsolver/elmer/equations/flow_writer.py
+++ b/src/Mod/Fem/femsolver/elmer/equations/flow_writer.py
@@ -261,7 +261,7 @@ class Flowwriter:
         for obj in self.write.getMember("Fem::ConstraintPressure"):
             if obj.References:
                 for name in obj.References[0][1]:
-                    pressure = self.write.getFromUi(obj.Pressure, "MPa", "M/(L*T^2)")
+                    pressure = float(obj.Pressure.getValueAs("Pa"))
                     if obj.Reversed:
                         pressure *= -1
                     self.write.boundary(name, "External Pressure", pressure)
diff --git a/src/Mod/Fem/femtest/data/calculix/box_static.FCStd b/src/Mod/Fem/femtest/data/calculix/box_static.FCStd
index 79d32f7b70..a4d7ac06e0 100644
Binary files a/src/Mod/Fem/femtest/data/calculix/box_static.FCStd and b/src/Mod/Fem/femtest/data/calculix/box_static.FCStd differ
diff --git a/src/Mod/Fem/femtest/data/calculix/box_static.inp b/src/Mod/Fem/femtest/data/calculix/box_static.inp
index f5ad252b4c..4cf403b43c 100644
--- a/src/Mod/Fem/femtest/data/calculix/box_static.inp
+++ b/src/Mod/Fem/femtest/data/calculix/box_static.inp
@@ -556,22 +556,22 @@ FemConstraintFixed,3
 ** FemConstraintPressure
 *DLOAD
 ** FemConstraintPressure: face load
-3,P1,1000
-6,P3,1000
-9,P2,1000
-36,P1,1000
-38,P1,1000
-56,P1,1000
-61,P3,1000
-67,P2,1000
-68,P3,1000
-75,P2,1000
-76,P4,1000
-78,P4,1000
-79,P2,1000
-90,P3,1000
-105,P3,1000
-125,P3,1000
+3,P1,1000.0
+6,P3,1000.0
+9,P2,1000.0
+36,P1,1000.0
+38,P1,1000.0
+56,P1,1000.0
+61,P3,1000.0
+67,P2,1000.0
+68,P3,1000.0
+75,P2,1000.0
+76,P4,1000.0
+78,P4,1000.0
+79,P2,1000.0
+90,P3,1000.0
+105,P3,1000.0
+125,P3,1000.0
 
 ***********************************************************
 ** Outputs --> frd file
@@ -590,8 +590,8 @@ RF
 
 ***********************************************************
 ** CalculiX Input file
-**   written by    --> FreeCAD 0.17.9749 (Git)
-**   written on    --> Sun Jan 22 14:28:56 2017
+**   written by    --> FreeCAD 0.21.0
+**   written on    --> Tue Mar 28 06:53:21 2023
 **   file name     --> 
 **   analysis name --> Analysis
 **
diff --git a/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.FCStd b/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.FCStd
index 26af91cb95..ef4a1a099e 100644
Binary files a/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.FCStd and b/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.FCStd differ
diff --git a/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp b/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp
index 61e7a9a212..883a37b530 100644
--- a/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp
+++ b/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp
@@ -4346,20 +4346,163 @@ Evolumes
 22,
 91,
 92,
-93,
-94,
-95,
-96,
-97,
 98,
 99,
-164,
-165,
-166,
-167,
-168,
-274,
-366,
+100,
+101,
+102,
+103,
+104,
+105,
+106,
+107,
+108,
+109,
+110,
+111,
+112,
+113,
+114,
+115,
+116,
+117,
+118,
+119,
+120,
+121,
+122,
+123,
+124,
+125,
+126,
+127,
+128,
+129,
+130,
+131,
+132,
+133,
+134,
+135,
+136,
+137,
+138,
+139,
+140,
+141,
+142,
+143,
+144,
+145,
+146,
+147,
+148,
+149,
+150,
+151,
+152,
+153,
+154,
+155,
+156,
+157,
+158,
+159,
+160,
+161,
+162,
+163,
+275,
+276,
+277,
+278,
+279,
+280,
+281,
+282,
+283,
+284,
+285,
+286,
+287,
+288,
+289,
+290,
+291,
+292,
+293,
+294,
+295,
+296,
+297,
+298,
+299,
+300,
+301,
+302,
+303,
+304,
+305,
+306,
+307,
+308,
+309,
+310,
+311,
+312,
+313,
+314,
+315,
+316,
+317,
+318,
+319,
+320,
+321,
+322,
+323,
+324,
+325,
+326,
+327,
+328,
+329,
+330,
+331,
+332,
+333,
+334,
+335,
+336,
+337,
+338,
+339,
+340,
+341,
+342,
+343,
+344,
+345,
+346,
+347,
+348,
+349,
+350,
+351,
+352,
+353,
+354,
+355,
+356,
+357,
+358,
+359,
+360,
+361,
+362,
+363,
+364,
+365,
 559,
 560,
 561,
@@ -4381,21 +4524,75 @@ Evolumes
 649,
 650,
 651,
-652,
-653,
-654,
-655,
-656,
-657,
 658,
 659,
 660,
-727,
-728,
-729,
-730,
-731,
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@@ -4408,24 +4605,348 @@ Evolumes
 742,
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 744,
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 ***********************************************************
 ** constraints contact surface sets
@@ -5055,7 +5576,7 @@ Evolumes
 DEPConstraintContact,INDConstraintContact
 *SURFACE INTERACTION, NAME=INTConstraintContact
 *SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=LINEAR
-1000000.0 
+1000000
 
 ***********************************************************
 ** At least one step is needed to run an CalculiX analysis of FreeCAD
@@ -5077,258 +5598,15 @@ ConstraintFixed,3
 ** ConstraintPressure
 *DLOAD
 ** ConstraintPressure: face load
-1322,P2,100.0
-1516,P1,100.0
-1701,P1,100.0
-1727,P1,100.0
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-2521,P1,100.0
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-2537,P4,100.0
-2542,P1,100.0
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-2550,P3,100.0
-2552,P4,100.0
-2556,P3,100.0
-2557,P2,100.0
-2559,P2,100.0
-2560,P2,100.0
-2570,P1,100.0
-2580,P2,100.0
-2584,P2,100.0
-2585,P1,100.0
-2586,P1,100.0
-2589,P1,100.0
-2592,P3,100.0
-2596,P2,100.0
+1733,P4,100.0
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+1981,P4,100.0
+2040,P1,100.0
+2304,P2,100.0
+2380,P3,100.0
+2463,P2,100.0
+2470,P2,100.0
+2547,P1,100.0
 
 ***********************************************************
 ** Outputs --> frd file
@@ -5347,8 +5625,8 @@ RF
 
 ***********************************************************
 ** CalculiX Input file
-**   written by    --> FreeCAD 0.19.19463 (Git)
-**   written on    --> Mon Feb  3 23:28:02 2020
+**   written by    --> FreeCAD 0.21.0
+**   written on    --> Tue Mar 28 06:51:00 2023
 **   file name     --> 
 **   analysis name --> Analysis
 **
diff --git a/src/Mod/Fem/femtest/data/calculix/constraint_sectionprint.inp b/src/Mod/Fem/femtest/data/calculix/constraint_sectionprint.inp
index 253c38210c..e8ff5f13c9 100644
--- a/src/Mod/Fem/femtest/data/calculix/constraint_sectionprint.inp
+++ b/src/Mod/Fem/femtest/data/calculix/constraint_sectionprint.inp
@@ -3425,24 +3425,24 @@ SOF, SOM, SOAREA
 ** ConstraintPressure
 *DLOAD
 ** ConstraintPressure: face load
-846,P3,100
-861,P1,100
-875,P4,100
-883,P3,100
-887,P1,100
-888,P1,100
-903,P1,100
-929,P4,100
-933,P3,100
-936,P1,100
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-940,P1,100
-941,P1,100
-946,P4,100
-949,P2,100
-951,P4,100
-954,P3,100
-955,P4,100
+846,P3,100.0
+861,P1,100.0
+875,P4,100.0
+883,P3,100.0
+887,P1,100.0
+888,P1,100.0
+903,P1,100.0
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+937,P1,100.0
+940,P1,100.0
+941,P1,100.0
+946,P4,100.0
+949,P2,100.0
+951,P4,100.0
+954,P3,100.0
+955,P4,100.0
 
 ***********************************************************
 ** Outputs --> frd file
@@ -3461,8 +3461,8 @@ RF
 
 ***********************************************************
 ** CalculiX Input file
-**   written by    --> FreeCAD 0.19.21759 (Git)
-**   written on    --> Wed Jun 24 09:14:56 2020
+**   written by    --> FreeCAD 0.21.0
+**   written on    --> Tue Mar 28 06:49:11 2023
 **   file name     --> 
 **   analysis name --> Analysis
 **
diff --git a/src/Mod/Fem/femtest/data/calculix/constraint_transform_beam_hinged.inp b/src/Mod/Fem/femtest/data/calculix/constraint_transform_beam_hinged.inp
index 92bd75d962..a81cedf777 100644
--- a/src/Mod/Fem/femtest/data/calculix/constraint_transform_beam_hinged.inp
+++ b/src/Mod/Fem/femtest/data/calculix/constraint_transform_beam_hinged.inp
@@ -3655,124 +3655,124 @@ FemConstraintDisplacment,1
 ** FemConstraintPressure
 *DLOAD
 ** FemConstraintPressure: face load
-1384,P3,10
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+1935,P4,10.0
+1943,P3,10.0
+1976,P4,10.0
+1982,P2,10.0
+1984,P4,10.0
 
 ***********************************************************
 ** Outputs --> frd file
@@ -3791,8 +3791,8 @@ RF
 
 ***********************************************************
 ** CalculiX Input file
-**   written by    --> FreeCAD 0.20.25211 (Git)
-**   written on    --> Fri Jul  9 17:37:32 2021
+**   written by    --> FreeCAD 0.21.0
+**   written on    --> Tue Mar 28 06:46:40 2023
 **   file name     --> constraint_transform_beam_hinged.FCStd
 **   analysis name --> Analysis
 **
diff --git a/src/Mod/Fem/femtest/data/calculix/material_multiple_tensionrod_twoboxes.inp b/src/Mod/Fem/femtest/data/calculix/material_multiple_tensionrod_twoboxes.inp
index ab2d0d6c2a..381828eb1b 100644
--- a/src/Mod/Fem/femtest/data/calculix/material_multiple_tensionrod_twoboxes.inp
+++ b/src/Mod/Fem/femtest/data/calculix/material_multiple_tensionrod_twoboxes.inp
@@ -1249,22 +1249,22 @@ ConstraintFixed,3
 ** ConstraintPressure
 *DLOAD
 ** ConstraintPressure: face load
-61,P3,1000
-74,P3,1000
-75,P3,1000
-80,P2,1000
-96,P3,1000
-99,P3,1000
-100,P4,1000
-102,P3,1000
-117,P3,1000
-118,P3,1000
-121,P3,1000
-124,P4,1000
-127,P2,1000
-131,P4,1000
-132,P4,1000
-134,P2,1000
+61,P3,1000.0
+74,P3,1000.0
+75,P3,1000.0
+80,P2,1000.0
+96,P3,1000.0
+99,P3,1000.0
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+117,P3,1000.0
+118,P3,1000.0
+121,P3,1000.0
+124,P4,1000.0
+127,P2,1000.0
+131,P4,1000.0
+132,P4,1000.0
+134,P2,1000.0
 
 ***********************************************************
 ** Outputs --> frd file
@@ -1283,8 +1283,8 @@ RF
 
 ***********************************************************
 ** CalculiX Input file
-**   written by    --> FreeCAD 0.19.19432 (Git)
-**   written on    --> Fri Jan 31 08:06:05 2020
+**   written by    --> FreeCAD 0.21.0
+**   written on    --> Tue Mar 28 06:48:16 2023
 **   file name     --> 
 **   analysis name --> Analysis
 **
diff --git a/src/Mod/Fem/femtest/data/calculix/material_nonlinear.inp b/src/Mod/Fem/femtest/data/calculix/material_nonlinear.inp
index 4e1e0c5b30..da02ee8944 100644
--- a/src/Mod/Fem/femtest/data/calculix/material_nonlinear.inp
+++ b/src/Mod/Fem/femtest/data/calculix/material_nonlinear.inp
@@ -20022,86 +20022,86 @@ ConstraintFixed,3
 ** ConstraintPressure
 *DLOAD
 ** ConstraintPressure: face load
-4796,P3,-130
-4799,P4,-130
-4872,P4,-130
-4875,P1,-130
-5260,P3,-130
-5261,P4,-130
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-9169,P4,-130
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+11114,P3,-130.0
+11157,P1,-130.0
+11158,P4,-130.0
 
 ***********************************************************
 ** Outputs --> frd file
@@ -20120,8 +20120,8 @@ RF
 
 ***********************************************************
 ** CalculiX Input file
-**   written by    --> FreeCAD 0.19.19432 (Git)
-**   written on    --> Fri Jan 31 08:04:49 2020
+**   written by    --> FreeCAD 0.21.0
+**   written on    --> Tue Mar 28 07:12:17 2023
 **   file name     --> 
 **   analysis name --> Analysis
 **