Subject invalid custome DML column reference: RDB$DB_KEY
Author james_027
Iam trying to learn this new stuff. And I always get this message,
what does it mean and what should I do to prevent.

Why is it that when I have my Tquery active in the design time it
doesn't appear to be active at the runtime. I have to add a code to
make it active at the runtime. Is there something needed to be done?