SAP Note 18733 - RFFDKU00 Problems with customer/vendor documents

Symptom:

RFFDKU00 (setup report for cash management and forecast) does not set up the cash planning dates or deletes them again for customers and vendors, if the G/L account documents for the bank clearing accounts are to be set up.

Cause and prerequisites

The 'Line item display' attribute is set for the reconciliation account in the master record. This, however, is not very useful for reconciliation accounts but technically possible.

Solution
Either you first start RFFDKU00 for the G/L accounts and then for the customers and vendors, that is, you first only have to execute the report for account type 'S' and then in a second run only for the account types 'D' and 'K'.
Alternative:
Insert one line in FORM routine S-BELEGLESEN (almost at the end of the FORM routine).

FORM S-BELEGLESEN.
...
SELECT SINGLE * FROM BSEG
...
IF SY-SUBRC <> 0.
...
ENDIF.

CHECK: BSEG-KOART = 'S'. "INSERT