Solution : https://service.sap.com/sap/support/notes/619203 (SAP Service marketplace login required)
Summary :
When creating or modifying a purchase order or requisition in SAP (e.g., ME21N, ME22N, ME51N), unwanted derivation of account assignment objects occurs, even when fields are hidden. This can cause error KI249, indicating multiple account assignments. The issue arises from default or derived settings in Cost Center Accounting (SPRO -> IMG). To prevent erroneous object derivations, set the primary account assignment (like WBS for category 'P') as a mandatory field in Customizing (Transaction OLME). This action blocks default derivation until the field is populated.
Key words :
img -> controlling -> cost center accounting -> actual postings -> manual actual postings -> edit automatic account assignment, transaction olme -> account assignment -> maintain account assignment categories, account assignment tab page, 'main account assignment object', account assignment object exists, account assignment category 'p', cost center, display error message ki249, account assignment object, account assignment category
Related Notes :
| 496082 | FAQ: Account assignment in purchasing |