Hi @emilyk8r ,

I believe you are looking to inspect from the receipt window and return/Credit from PO header itself ?. I don't think this is possible on the current design. Yet you can always try for a custom menu preferably inline level. 

Agree with the previous comment!!

Also be mindful on the handling part of it, since a Credit Memo is normally issues against a Purchase Order itself to be set off against the total Account Payable for the whole Order (including other information like terms of payment and invoicing, shipping address, a list of items, prices, quantities, and the date of purchase)

So better to evaluate the way to present this information with respect to PO and also how to set off the credit against multiple receipts connected Invoices under the same PO.

As already highlighted our colleagues, there is no way to add the credit to the PO itself directly.

  But, you can receive credit notes from the supplier, then the invoice workflow needs to match with the exact PO Return for Credit item.