How to alter data after a sale has been made?

[lastporter]

I'm the newest one of 10 artists in a co-op gallery/shop where most of the crew is pretty tech-phobic: our POS is a very underutilized tool. With the hope of gathering more data for end of month reporting, I recently set up Favorites tiles within the Checkout tab that each correspond to our 10 artist's initials.

Ideally when a sale is initiated, the cashier would tap the correct tile for the artist whose item is being sold, enter the price of the item, and proceed to check out. There have been a few incorrectly entered sales: say artist A was entered but it was actually an item by artist B.

Is there a way to go back into a sale once it's completed and change which artist the sale is attributed to? 

Thanks for any help!

[Candlestore]

@lastporter ;

This is not possible since the Transaction was already completed.  

Now to keep this from happening again, since it sounds like human error.  Create Items for each Vendor.  So Vendor A Item1, Vendor B Item 2 etc.  Now when each vendor as at least 1 item, goto onto your Square Items Catalog tap Actions towards the top right, a menu will pop up with a few options, one of them is Generate SKU.  By clicking that Square generates a SKU for all Items that do not already have a SKU.  If you do not have the Generate SKU in the pop up menu you can create one yourself.  Say 7 random letters and numbers if you accidentally do this and create one that is already in use I belive Square has a Pop Up warning that the SKU is duplicated.  Now you can do a number of things with this SKU, Have the vendors print their own SKU to place a sticky Label on the back of every item.  For each Item with a Sellers SKU leave the Price field empty.  By leaving the Price field Empty, Square asks for the $ amount of the Item being sold.    Since you only have 10 Vendors currently, you can have a List by your Point of Sale Devices and then Search for the vendor and Scan their Associated Barcode then enter their price for the item sold.  Now with these methods it would require purchasing a scanner.