Specifies the side of the Datum to reference.
This property is OPTIONAL and should only be set when the referenced item is a Datum.
One of the following strings is valid (they correspond to the entry in the CREO GUI)
RED (old format of PRIMARY, is equal to it)
YELLOW (old format of SECONDARY, is equal to it)
Dim CC as new CreoConstraintInfo
CC.AssemblyDatumSide="Primary" '' terms are not case sensitive.