I have a multi step route activated for purchase. So while I confirm a purchase order pickings from vendor to Input, input to quality control and quality control to stock are generated and chained correctly.
I want an additional functionality in the last picking, like if we fail the quality control move those items to a Repair Location. For 10 items we recieve 2 or 3 items goes to repair. Currently we cannot select any location other than the child location of destination specified in the picking. How can we acheive this? Every items are traceable. 

EDIT
Repair location is not actually a return location. And also return functionality can only done on done moves. Repair location is where the company will check if inhouse repair is possible or not, if not, then send to return to vendor.