Solution : https://service.sap.com/sap/support/notes/132063 (SAP Service marketplace login required)
Key words : 
system displays purchasing documents marked, sales orders/purchase orders worklist, additional key words vl04, stock transport scheduling agreements, stock transport orders, purchase order, transaction vl04, scheduling agreement, stock transfer, generate deliveries
Related Notes : 
       
| 192423 | Delivery Processing Performance: Consulting | 
| 152972 | 'Delivery completed' docus exist in worklist | 
| 146818 | VL04: Dely for purchase order created w. EKPO-EGLKZ |