Solution : https://service.sap.com/sap/support/notes/865860 (SAP Service marketplace login required)
Key words :
system issues error message mepo049, single account assignment reason, single account assignment, account assignment category, multiple account assignment, account assignment data, account assignment item, multi account assignment', bapi_po_change function module, purchase order item
Related Notes :
| 1000184 | Account assignment error when document transfer to back end |
| 891356 | BAPI EnjoySAP: Exception Raise Failure |
| 748574 | BAPI_PO_CHANGE: Changing AAC w/ multiple account assignment |