Stock Packaging Usability

This module speeds up packing during a transfer (picking) in Odoo. On the operation lines of a transfer, next to the destination package field, two buttons appear: "Current Pack" and "New Pack". They are only visible for users who have the lots and packages tracking setting enabled, and only when the line has a done quantity and is not already packaged.

• "New Pack" creates a new empty package and links the line to it, so the done quantity is packed straight away.
• "Current Pack" reuses the last package already used on the same transfer, so several lines can be added to the same pack one after another.

The module also adds safety rules. It refuses to pack when the done quantity is zero, when the line is already in a package, or when no current package exists yet. If the done quantity is lower than the expected quantity, the line is split: the packed part goes into the package and the remaining quantity stays on the transfer to be handled later.

It works on the operation lines of transfers (stock.move.line) and touches packages and package levels (stock.quant.package, stock.package_level). No new menus or reports are added; everything happens through the two buttons on the transfer screen.