Reverse Outside Processing OO purchase order

Good Morning,

I'm working with 9.1.

I'm trying to resolve a receipt issue for a sub contract part.

The user received, however, hit the 'X' to exit vs. green check to complete the WO completion pop up.

We have an OV, no IM, and routing operation is open.

I attempted to correct, by reversing the receipt, again selecting the 'X' to exit (replicating the reversal of the users actions), however I'm unable to confirm reversal to complete the transactions.

What is the best practice for correcting this issue?

Thanks

Teri