Unable to return an inventory part to Supplier after I received it in error.

Hello Pals,

I  received the wrong line on a Purchase Order which was an inventory number. I then tried to return the items back to the supplier and the items were not on the screen to be returned. I looked at the P/O and they show that they have been received. Something happened in the process and it did not complete the task. The P/O number is 201521648 and the first line was received in error (P/N 0069123722). I need that line backed out because those parts will not be here for a few weeks.

Thank you

Roy