Solution : https://service.sap.com/sap/support/notes/128803 (SAP Service marketplace login required)
Key words : 
additional key words ekpo-elikz, stock transport order, purchase order item, longer effective, planning purposes, goods issue, delivery completed, attached correction, indicator manually, prerequisites
Related Notes : 
       
| 146979 | EKPO-EGLKZ is ignored in MRP | 
| 146818 | VL04: Dely for purchase order created w. EKPO-EGLKZ |