[FIX] stock_picking_barcode error with lots

[parchanco]

Hi,
When I try to add a lot for more than one product after pressing the "Put in cart button" the browser displays a modal windows with the following information:
Odoo Warning - Warning
You have a difference between the quantity on the operation and the quantities specified for the lots.

The steps followed where: scan 2 products with the barcode scanner, add an existent lot to the line and click the "Put in cart button"

As far as we know, the system does not assign the lot to the quantity put on the screen, it assigns it only to one unit. e.g. if the scanned quantity to receive is 5 and I create a lot, when I press create lot, it assigns this lot only to one unit not to the 5 units scanned.

If there are more than one lot, the problem is the same, I scan 2 units and create lot 1, and I scan 3 more units and create lot 2. As a result lot1 is assigned to one unit and lot 2 is assigned to 1 unit. Then the system does not allow to put in cart.

You can see the lot in the following image:

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