Regarding the "Unscanned Quantity" side, instead of the scanned quantity show the unscanned quantity (name "Unscanned Quantity") next to the total quantity. This needs to be reduced by the packaging's quantity each time an EAN codes is scanned/entered. As for the "Scanned Quantity side", rename "Scan Quantity" to "Scanned Quantity" and show all lines that have a scanned quantity greater than 0. The scanned quantity needs to be updated, respectively, each time an EAN code is scanned/entered. Furthermore, we need to be able to completely reset the scanning process. Create a "Reset" button that resets all scanned quantities to 0 and resets the state to "assigned" for the current picking. It has to be possible to reset a picking which the scanning process was completed for, too!
This is still incomplete. The left side should show the unscanned quantity (and the field should be named likewise), not the scanned quantity. The right side should show the row from the left side as soon as there is at least 1 scanned article in this row, so we have the same row on both sides while showing unscanned on the left and scanned on the right. "Scan Quantity" should be renamed to "Scanned Quantity".