Solution : https://service.sap.com/sap/support/notes/146600 (SAP Service marketplace login required)
Key words : 
additional key words vl07, function module mb_create_goods_movement, goods receipt, delivery completed, scheduling agreement, ekpo-elikz, program error, error occurs, goods receipts, correction instructions
Related Notes : 
       
| 146979 | EKPO-EGLKZ is ignored in MRP | 
| 146818 | VL04: Dely for purchase order created w. EKPO-EGLKZ | 
| 95960 |