Solution : https://service.sap.com/sap/support/notes/1629736 (SAP Service marketplace login required)
Key words :
prerequisites extended po change, unexpected budget error, extended classic, effects budget, symptom follow-, solution apply, note 1290496, budget_check, bapi_po_change, simulation
Related Notes :
| 1623768 | E RE164 occurs unexpected temporary |
| 1557793 | Classic Scenario: unexpected budget error for SC with PR |