Stock Picking Auto Create Lot

This module adds an automatic lot/serial number creation option to Odoo's inventory workflow.

• On a product form, a new checkbox "Auto Create Lot" appears next to the tracking setting, but only when the product is tracked by lot or serial number.
• On an operation type (for example Receipts), a new "Auto Create Lot" checkbox appears next to the existing lots setting.

When both the product and the operation type have this option enabled, Odoo fills in the lot or serial number automatically on the transfer lines when the transfer is validated. The number is taken from the standard lot/serial number sequence, so each line gets the next available reference.

Because the number is filled in automatically, the manual "Assign Serial Numbers" action is hidden for those moves, avoiding double entry. Also, when quantities are reserved, lines that already have a lot assigned get their quantity set to the full reserved quantity.

The automatic numbering runs both when the user clicks Validate and when the transfer is completed internally, so it also works for transfers finished by other processes. The module touches product.template, stock.picking.type, stock.picking, stock.move and stock.move.line.