>Hi,
>
>I ran into the following issue (not major but I want to see if there is a simple way around it). I have a foreign key constraint set in child tables on a unique field in a parent table. I want to change the unique field expression in the parent table (instead of just one field to make it on two fields). When I try to change the unique index key I get a message that 'the primary key or unique constraint cannot be changed until its existing relationships are deleted.' This means that I have to delete the FK constraints on all child tables; then change this unique key, and then create FK constraints again. Is there a simpler method? TIA.

I think that's the correct way to work this issue and no other methods exist.