@hereforifs has this rental part created rental transactions?

yes the rental part has created rental transactions.

is there any screen or process where we can undo the delivered return supplier shipment

??

@hereforifs Im wondering now how you created the Supplier Shipment for rental PO receipt, as we  receive the error - “ You are not allowed to perform this transaction RETWORK on Supplier Rented Stock. ” - when trying to create the supplier shipment.
 

you can RMB on the PO rental part line on purchase order screen then go to the rental workbench. Then you can RMB on the line and go to supplier shipment » return supplier, your return supplier shipment will be created.

Is your supplier an internal supplier?

no, it’s an external supplier.

I am using APP10 and I cannot create a supplier shipment for supplier rented stock. 

However, what happens when you try to undo inspection results and revert the shipment in the std flow?