Solution : https://service.sap.com/sap/support/notes/1098459 (SAP Service marketplace login required)
Key words :
alm bapi downgrade kit, status 'technically completed', relevant correction instructions, error message iw 516, 'assigning pm order, wbs element xy, wbs element, bapi bapi_alm_order_maintain, bapi terminates, order header
Related Notes :
| 708508 | Downgrade BAPI_ALM_ORDER_MAINTAIN -> errors |