Ed,

> > As you can see, I have inserted NULL in FK column. Does that answer
> > the question?
>
> Yes--I had a bit more complex situation and could not get it to work.
> Thanks for your time.

Did your problem involve FKs which were also part of a PK or unique
index?

If so, then all FB v1.0 and IB versions did not allow NULLs in the
key/index.

FB v1.5 allows you to define a PK/Unique index with NULLs.


Sean