Hi,

Currently, you have ordered product A. But, you received both products A and B. Since you have validated the receipt, the stock of those products will be added to the inventory. Now, you can't edit the quantities in that receipt. But, you can use the 'Return' button to return product B. Once you click on the 'Return' button a wizard will be opened. The products in the receipt with their done quantities will be listed in it. You can edit the quantities to be returned. But, in this case, you have to remove product A from it using the trash icon. Then, click on the "Return' button to create the reverse transfer for product B. The stock of product B will be removed from the inventory on validating the transfer.

Regards