I have a problem, when removing an UDF.
I have an UDF "round", that does axactly the same the internal function round does.
So I want to remove the UDF round, to use the internal function.

I removed it by

drop external function round;

To do so, I had to alter many stored procedures and triggers, for round was used there.

Finally I could drop the external function round.

Now I have a problem when making a backup. Gbak tells me, that the external function round is missing.
The same problem when using b_line_count (an UDF that counts the lines of a text blob). "invalid request BLR at offset 6 function round not defined".

I had to declare the UDF again to get it working.

What could be the reason for this problem=