Change the posting date Value for reversed items in CO14

Hi Experts,

We have a requirement to change the "Posting Date" column values in transaction CO14. This is only for "reversals". We execute the reversal through IDoc.

I already tried changing the afrud_tab-BUDAT field in the following USEREXITS -

  ZXCOFU15

  ZXCOFU20

I got these exits based on the package of transaction code CO13, as per my functional contact, this is being used for reversals.

I can see the BUDAT field changing during debug. But when I go to transaction code CO14, checked the "Posting Date" column, it's still the same. It remained unchanged.

It looks like I'm updating the wrong field (BUDAT). But how can I know? In CO14, once you highlight the field and press F1, it gives me BUDAT. Or maybe I'm updating the wrong workarea (afrud_tab).

I would really appreciate your help. Thanks!