ECM CA01, CA02 only on one plant, CA03 not to require a change number

The problem: I have more than one plant at client level. I need to assign change numbering to one as mandatory and not the other.

That said, CA03 must not require a change number at client level.

OP5A: I have set this at plant level so that only plant A has mandatory Change Numbering, But CA03 still requires a number, even after specifying CA01 and CA02 as transactions.

I do not se a way past this, if you know a method on how this can be achieved. Please let me know.

Thanks in advance,

Ian McGilp