> I have a field that was set to not null at first, then change to allow
> null. But still when Iam trying to save a record with a null value, it
> says a validation error for column REMARKS, value ***null***
>
> Iam using ibexpert on firebird(lastest version)

Close all connections to the database and try again.

With regards,

Martijn Tonies
Database Workbench - developer tool for InterBase, Firebird, MySQL & MS SQL
Server.
Upscene Productions
http://www.upscene.com