In the PartDesign context, an element having a Reference constraint
will not move during the update.
The Assembly context allows two behaviours :
Either the element will not move,
or the element will move to the position where it was when
the Reference type has been set to FixInSpace.
ReferenceType. This enum lists appropriate values to
set this property.
Values:
catCstRefTypeRelative
The element will not move during the update (the default mode).
catCstRefTypeFixInSpace
The element will move to its former position (Assembly context only).