diff --git a/src/Mod/Material/App/Array2DPyImp.cpp b/src/Mod/Material/App/Array2DPyImp.cpp
index ee90abc23a..549dc673aa 100644
--- a/src/Mod/Material/App/Array2DPyImp.cpp
+++ b/src/Mod/Material/App/Array2DPyImp.cpp
@@ -159,7 +159,9 @@ PyObject* Array2DPy::setValue(PyObject* args)
     if (PyArg_ParseTuple(args, "iiO!", &row, &column, &PyUnicode_Type, &valueObj)) {
         Py::String item(valueObj);
         try {
-            QVariant variant = QVariant::fromValue(Base::Quantity::parse(item.as_string()));
+            auto quantity = Base::Quantity::parse(item.as_string());
+            quantity.setFormat(MaterialValue::getQuantityFormat());
+            QVariant variant = QVariant::fromValue(quantity);
             getArray2DPtr()->setValue(row, column, variant);
         }
         catch (const InvalidIndex&) {
diff --git a/src/Mod/Material/App/Array3DPyImp.cpp b/src/Mod/Material/App/Array3DPyImp.cpp
index 794e9eacad..c6ee68510a 100644
--- a/src/Mod/Material/App/Array3DPyImp.cpp
+++ b/src/Mod/Material/App/Array3DPyImp.cpp
@@ -163,10 +163,16 @@ PyObject* Array3DPy::setDepthValue(PyObject* args)
     if (PyArg_ParseTuple(args, "iO!", &depth, &PyUnicode_Type, &valueObj)) {
         Py::String item(valueObj);
         try {
-            getArray3DPtr()->setDepthValue(depth, Base::Quantity::parse(item.as_string()));
+            auto quantity = Base::Quantity::parse(item.as_string());
+            quantity.setFormat(MaterialValue::getQuantityFormat());
+            getArray3DPtr()->setDepthValue(depth, quantity);
         }
-        catch (const InvalidIndex&) {
-            PyErr_SetString(PyExc_IndexError, "Invalid array index");
+        catch (const Base::ParserError& e) {
+            PyErr_SetString(PyExc_ValueError, e.what());
+            return nullptr;
+        }
+        catch (const InvalidIndex& e) {
+            PyErr_SetString(PyExc_IndexError, e.what());
             return nullptr;
         }
         Py_Return;
@@ -185,10 +191,16 @@ PyObject* Array3DPy::setValue(PyObject* args)
     if (PyArg_ParseTuple(args, "iiiO!", &depth, &row, &column, &PyUnicode_Type, &valueObj)) {
         Py::String item(valueObj);
         try {
-            getArray3DPtr()->setValue(depth, row, column, Base::Quantity::parse(item.as_string()));
+            auto quantity = Base::Quantity::parse(item.as_string());
+            quantity.setFormat(MaterialValue::getQuantityFormat());
+            getArray3DPtr()->setValue(depth, row, column, quantity);
         }
-        catch (const InvalidIndex&) {
-            PyErr_SetString(PyExc_IndexError, "Invalid array index");
+        catch (const Base::ParserError& e) {
+            PyErr_SetString(PyExc_ValueError, e.what());
+            return nullptr;
+        }
+        catch (const InvalidIndex& e) {
+            PyErr_SetString(PyExc_IndexError, e.what());
             return nullptr;
         }
         Py_Return;