If you enter an incorrect SKU into a full batch and you do not wish to delete the batch or the list, you can zero out the SKU's quantity using the Edit Items function. Select the incorrect item and either double click or use the button at the bottom of the screen.
Once you have access the Edit Items box, enter a new quantity of zero into the "New Quantity" field. Press the button to apply your changes. The updated item will then appear on your screen with zero as the Qty.