Error in KKA3 Do not create line IDs of 'Settlement' cat. when defining assignmnt rules

Hello Guys, please support me with this Error in KKA3- Ressult Analysis for SO- Do not create line IDs of 'Settlement' cat. when defining assignmnt rules.

I already went to change from A to K into OKGA for Line ID ABR.

...but my problem persists in KKA3 and I can not settlement the Sales Doc in VA88 also according with Message no. KD256 ,There are no accrued amounts; settlement is not possible.

Any comments and solutions, please let me know ASAP.

Best regards.