Hi Cathy,
Sorry about the pain
I have recreated this behaviour with a simple model based on your previous updates
E1 has optional relationship to E2 (FK_E2ID2)
E1 has mandatory relationship to E3 (FK_E3ID3)
DB2
By default the FK_E2ID2 RI Constraint is set to DBMS - generated DDL has FK creation
By default the FK_E3ID3 RI Constraint is set to DBMS - generated DDL has FK creation
Oracle
By default the FK_E2ID2 RI Constraint is set to Gen. When change to DBMS the generated DDL contains Trigger code rather than FK creation
By default the FK_E3ID3 RI Constraint is set to DBMS – generated DDL has FK creation
I will discuss further with Gen Product Owner JCarter
Regards,
Lynn