Solution : https://service.sap.com/sap/support/notes/611294 (SAP Service marketplace login required)
Key words : 
bapi bapi_alm_order_maintain takes, symptom processing, terms bus2080, bus2007 reason, solution implement, attached corrections, urgent implementation, 1000 orders, prerequisites, operations
Related Notes : 
       
| 736204 | Notes for downgrade kit ALMBAPI I | 
| 708508 | Downgrade BAPI_ALM_ORDER_MAINTAIN -> errors | 
| 611293 | Performance improvements CO_BO_OPR_OF_ORDER_GET |