Solution : https://service.sap.com/sap/support/notes/146818 (SAP Service marketplace login required)
Key words : 
sales order/purchase orders worklist, additional key words vl02, stock transport orders, purchase order, stock transfer, transaction vl04, purchasing documents, delivery completed, scheduling agreement, shipping index
Related Notes : 
       
| 160247 | VL04:Item incorrectly set on 'Delivery completed' | 
| 160051 | Completion of purchase order item via delivery | 
| 146979 | EKPO-EGLKZ is ignored in MRP | 
| 146600 | VL07:"Delivery completed"ind.in scheduling agreemnt | 
| 132063 | VL04 Shipping index EKUB only partially reduced | 
| 128803 | MB11:"Delivery completed" ind.in stck trnsprt order |