Solution : https://service.sap.com/sap/support/notes/127662 (SAP Service marketplace login required)
Key words : 
additional key words goods movementcollective order, data element enwrt          enwrtdefine waers, respective quantity fields afpo-wemng, source direct procurement assembly, enhance dictionary structure resbdircnf, activate enhanced structure resbdircnf, resb-enwrt remain empty, fields afpo-wewrt, lower-level order, goods movements simulated
Related Notes : 
       
| 160428 | CO_BI_AFPO_SET is unknown: Error in Note 127662 | 
| 155282 | CO docs for confirmations: Correction programs | 
| 126710 | Update problems in collective orders |