SAP Note 27187 - MR01: Changing the account assignment

Symptom:

Key words: MR01, purchase order assigned to an account, screen 202.
Changing the account assignment.

Error when changing account assignment.
The purchase order contains several items assigned to an account and a goods receipt is only expected for some of the items.
Depending on whether you expect a goods receipt for the last item, you may or may not change the account assignment of the item from the overview screen (screen 202).
For example: Purchase order with two items. Overview screen, correction ON, Extras --> Account assignment
Item 1 with GR posting, item 2 without GR posting
----> You can change the account assignment of both items
Item 1 without GR posting, item 2 with GR posting
----> You cannot change the account assignment of any of the items.
Further symptom:
For positions with goods-receipt-based invoice verification, the reference to the GR document in the purchase order history might get confused. This may cause problems in the following invoices or credit memos: in the case of invoices, the full quantities are proposed again, for credit memos, no default value is set.

Cause and prerequisites

Error in the source code.

Solution
Corrected in Release 3.0B. You can make the following advance corrections.
You can correct the purchase order history using program RM06HL20 (on SAPSERV3 in directory /general/R3server/abap/note.0027187). The report selects not all possible cases but only the most frequent one, in which exactly one goods receipt and one invoice receipt do exist.