Stock Move Purchase UoM

This module adds two settings to each operation type (for example Receipts, Delivery Orders, Internal Transfers) in the Warehouse configuration.

• A checkbox "Use Purchase UoM" decides whether moves of that operation type should be expressed in the product's purchase unit of measure instead of the usual stock unit.
• A rounding method field, shown only when the checkbox is ticked, chooses how quantities are rounded when converting: "Closest" (half-up) or "Up". It defaults to "Closest".

When the option is active, creating a stock move automatically converts the quantity into the product's purchase unit and stores it in that unit. The same happens when you pick a product on a move form: the unit of measure is switched to the purchase one. On detailed operations lines, if no move is linked yet and no unit was already chosen, the purchase unit is also applied.

Moves that are returns of an earlier move are left untouched, so returned goods keep their original unit. The module only extends existing stock models (stock.move, stock.move.line, stock.picking.type) and adds no new menus or reports; the new fields appear on the operation type form, right after the backorder setting.