Yes. In the PO transactions folder the Return screen will reverse all or part of the Receipt entry, and then if needed the Credit Note screen will reverse all or part of the invoice. Note the original documents always remain in place, but with a return / credit overlaid. Refer to the manual or F1 help for details.

Yes. In the PO transactions folder the Return screen will reverse all or part of the Receipt entry, and then if needed the Credit Note screen will reverse all or part of the invoice. Note the original documents always remain in place, but with a return / credit overlaid. Refer to the manual or F1 help for details.

Thank you.  Would these leave the original PO as an open PO then?

No

Note, that, whilst WWoolmer is correct, keep in mind that if you had added any additional costs to the receipt for freight, duty, etc, these do not get reversed.

Sweet point :)