Hello,
I have the following model:

column table_3.column_1 is enforced as mandatory by a mandatory fk to table_1.
column table_3.column_1 and table_4_column_2 are enforced optional by an optional fk to table_4.
So there is a conflict for table_3.column_1 and the following window pops-up:

Pressing Yes tries to make column_1 optional but it does not succeed, which is correct.
The pop-up should not occur for columns being enforced as mandotory by other mandatory fk's or other constraints like pk's.
Joop