You have created a return Purchase Order, however your PO doens´t appear in the list of My purchase Orders Due for Delivery
S/4 HANA CLOUD 1711
The supplier doesn´t have the flag 'returns Supplier' activated. This flag enables you to use shipping processing for supplier returns to supplier, for which you activated this function, at all your plants.
Activate the falg in Maintain Business partner App
KBA , MM-FIO-PUR-PO , Fiori UI for Purchase Orders , MM-PUR-PO , Purchase Orders , Problem