Solution : https://service.sap.com/sap/support/notes/736204 (SAP Service marketplace login required)
Key words : 
system issues error message iw006, system issues error message iwo_bapi2107, newly inserted include names, create export parameter ev_indexsumnr, specifically tailored correction instructions, error message iw161, error message c0820, attached correction instructions, pm planning plant, function group ibapi_o
Related Notes : 
       
| 735696 | Notes for Downgrade Kit ALMBAPI: Relevance | 
| 643574 | BAPI_ALM_ORDER_MAINTAIN: No immediate release possible | 
| 642831 | Error message IW 161 when creating order | 
| 640374 | ALM order BAPIs: Performance when reading networks II | 
| 640158 | ALM order BAPIs: Performance when networks are read | 
| 639785 | BAPI_ALM_ORDER_MAINTAIN: Deletion for only one operation | 
| 611294 | Performance improvements BAPI_ALM_ORDER_MAINTAIN III | 
| 602759 | BAPI_ALM_ORDER_MAINTAIN: Dump when operations are deleted | 
| 586597 | BAPI_ALM_ORDER_MAINTAIN: Error message IW006 | 
| 553528 | BAPI terminates with memory overflow or error C0(820) | 
| 528770 | External scheduling with BAPI |