Bapi or FM to update fields xref3, xref2 and zuonr
Please tell me the bapi or function module (API) which is used to update reference field xref3 and xref2 and zuonr field into bseg.
I used the module funcion CHANGE_DOCUMENT, but it is very dangerous..
Could you please tell me if there is another way to change these fields?
As regards the transaction fb02, I can oly change the bseg-zuonr field.