Different clearing rules in SAPF124

Hi Gurus,

usually we use the filed ZUONR as automatic Clearing rule for GR/IR account.

Now we have a Company code, which has a another Content in this field. We could use fields EBELN and EBELP.

The rules I store in customizing..are they like "and-rules" or is this like an "or" - this is because we can not set the rule by company code and of course we still need the ZUONR rule... so if it is an "and" we don't have a chance here anyway...

2.) Any suggestions how to solve it?

Many thanks in advance!

Sandra