Elmar,

> In FB 1.5 I did use an UDF for Trim() functionality. This UDF did
> Trim(null)=''.
>
> In FB 2.x Trim is an internal function which does Trim(null)=null.
>
> How can I make the internal function act as my UDF or how can I
> overoad the internal function with my UDF?

I suggest you fix your code to make it portable and not dependent on
your UDF. But if you're in a corner, I think that declaring your UDF in
the database will give it precedence over the internal function with the
same name.

HTH
--
Nando Dessena