The entry YR20 is missing in table T043G ( Message no. F5100 )

Trying to Post an Incoming Payment :- F-28

And getting an error message stating

The entry YR20 is missing in table T043G ( Message no. F5100 )

Tried Checking OBA3 - OBA4 - OB57 - Tolerance group is given and assigned. Tried all the previous answer procedures still getting the same error - can anybody help pls