Purchase Stock Packaging

This module changes how purchase order lines are generated automatically from stock replenishment needs (for example when a reordering rule or a manufacturing order triggers a purchase).

• If the stock need carries a packaging (a predefined pack size such as a box or a pallet), the generated purchase order line is created with that packaging's unit of measure instead of the product's default unit.
• The ordered quantity is converted into that packaging unit, so the buyer sees the quantity in packs rather than in single units.
• The unit price is also converted to the packaging unit, so the price stays consistent with the new unit of measure.
• If no packaging is present in the stock need, or the line already uses the same unit, nothing changes.

It works silently in the background: there is no new menu, screen or button. Users simply notice that purchase orders created automatically from stock needs show the packaging unit and the matching quantity and price. It touches the purchase order line model (purchase.order.line) and relies on the purchase and stock integration (purchase_stock).