Stock Picking Backorder Move Quantity

When a transfer is only partially done, Odoo normally asks whether to create a backorder and applies the same decision to every product line. This module adds a detailed list to that backorder confirmation window so you can decide per product.

• The confirmation wizard now shows one row per move, with the product, the quantity still unprocessed and an editable "quantity to backorder" field, plus its unit of measure.
• The quantity to backorder is pre-filled with the full remaining unprocessed quantity, so you only change the lines where you want something different.
• You cannot enter a negative quantity, and you cannot backorder more than what is still unprocessed; Odoo blocks the entry with an error message.
• The detailed list is hidden when the wizard is used in the "show transfers" mode, so the standard behaviour is kept there.
• When you confirm, the quantities you entered are used to split the moves and create the backorder accordingly.

It works inside the existing backorder confirmation wizard of the Inventory app and touches the transfer, move and backorder confirmation records. No new menu is added; the change appears directly in the pop-up window you already use when validating a partial transfer.