Hi, @MelMac, thanks for reaching out with your query. It's nice to see new faces popping up in the Seller Community!
This is a great question, at this stage, there isn't a way to edit the item included in a previous transaction without issuing any refund or processing an exchange (only available via Square Retail at this time).
Without issuing a refund, the only real option here is to make a note for your own records of the correct items that were processed and then manually adjust your stock via your Item Library.
Let us know if you have any further questions here!
Laurie
Community Moderator, Australia, Square
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