I have a reception in the application worksheet for 1500 pcs of an item and a shipment of 1500 pcs tied to it, I'm un-applying them and trying to tie the 1500 shipment to tie the shipment to three receipts, one 400 and two 550, in order to undo the receipt of the 1000, but this error is showing, what to do? I checked everything, the three receipts are not tied to anything.