Assembly: Fix lengths cannot be negative (#24625)

* Assembly: Fix lengths cannot be negative

* Update PropertyUnits.cpp

* Update PropertyUnits.h

* Update JointObject.py

src/App/PropertyContainerPyImp.cpp

@@ -30,6 +30,8 @@
 #include <boost/iostreams/device/array.hpp>
 #include <boost/iostreams/stream.hpp>
 
+#include "PropertyUnits.h"
+
 // inclusion of the generated files (generated out of PropertyContainerPy.xml)
 #include "PropertyContainerPy.h"
 #include "PropertyContainerPy.cpp"
@@ -272,6 +274,12 @@ PyObject* PropertyContainerPy::setPropertyStatus(PyObject* args)
                     continue;
                 }
 
+                auto lengthProp = freecad_cast<App::PropertyLength*>(prop);
+                if (lengthProp && v == "AllowNegativeValues") {
+                    lengthProp->enableNegative(value);
+                    continue;
+                }
+
                 PyErr_Format(PyExc_ValueError, "Unknown property status '%s'", v.c_str());
                 return nullptr;
             }
@@ -721,3 +729,4 @@ PyObject* PropertyContainerPy::renameProperty(PyObject* args) const
     }
     PY_CATCH
 }
+