Solution : https://service.sap.com/sap/support/notes/408944 (SAP Service marketplace login required)
Key words :
supposedly packed items, unfulfilled complete delivery, shipping units exist, source code corrections, shipping units, delivery items, delivery item, collective processing, individual orders, supplied due
Related Notes :
457698 | Delivery selected repeatedly for shipment |
300806 | Deletion of shipping unit for deliveries not created |