SAP Note 28009 - FB10: Incorrect line item is displayed

Symptom:

Transaction FB10 (invoice/credit memo fast entry). When you display an item on the overview screen, the incorrect line item is displayed at first. If you display it again, the correct line is displayed.

Cause and prerequisites

Program error

Solution
Corrected in Release 3.0B

Advance correction:
Transaction SE38.
Change program MF05AFF0 (FORM FCODE_BEARBEITUNG).
Search for the following statement in the source code and insert the lines marked with <--- INSERT:
*------- Beleguebersicht anzeigen --------------------------------------
when 'AB'.
rw_code = 'AB'.
get cursor field crs-field line crs-line.

if sy-dyngr ne 'U'. <--- INSERT
req-buzei = 0. <--- INSERT
endif. <--- INSERT