The repair order, regardless of whether it is being returned direct expense or from a warehouse, will not generate any GL entries. This is also a way to generate a packing slip to send back to the vendor, which can also be a way to track whether those parts have been received back from the vendor.
If selecting to return direct expense or creating the RMA from a work order's issue, the RMA populates with the parts associated with that issue.
Add a number to the received quantity on the far right of the RMA parts grid that is not greater than the quantity for that part on the RMA. If all part quantities are equivalent to the parts received amount, mark the RMA as closed.