SAP Message BK651 - Errors occurred when converting the entries & & & &

Diagnosis
Conversion program RKTRWPRX should enter function module &V4& in tableTRWPR. The entry chould contain the key &V1& &V2& &V3&.
The entry already exists in your system with the key "K-BELEG1" &V2&V3 or "k-beleg2" v2 v3.

System Response
Module &V4& was not entered. This problem should be removed beforeControlling postings are made in the productive system.
As the entry does not exist in table TRWPR, module &V4& is not run. Itis not possible to carry out user checks or manipulation of data thatis to be posted.

Procedure
Check the contents of table TRWPR. The entries for businesstransactions K-BELEG1 and K-BELEG2 are no longer valid. They have beenreplaced by entries for business transaction K-BELEG. Enter functionV4 for transaction k-beleg, if it does not yet exist there. discussthe exact position with originator of the entry under businesstransaction K-Beleg1 or K-Beleg2, as the order of the modules to beprocessed can be of importance.
To modify the entry call up transaction SM31, enter table TRWPR andchoose "Maintain". In the table you can find user-defined entries forthe business transactions K-BELEG1 and K-BELEG2. You can also see whatXPRA has already inserted for K-BELEG.