Stock Picking Move Package to Another Package

This module adds a "Destination Package" field to the package lines shown on a transfer (picking) in Inventory.

Where it appears: - On the package level list inside a transfer, right after the source package column, users see a new Destination Package column. - The field is editable only while the transfer is still in draft; once it is confirmed, waiting, done or cancelled it becomes read-only.

What it does automatically: - The destination package is filled in automatically when all the move lines of the package already point to the same result package; otherwise it stays empty. - When a user picks a destination package, the package line is flagged as done and every move line of that package is updated to use that destination package, while the original source package is kept. - Only packages from the same company are offered, and only those located in or under the transfer's destination location (or packages without a location). - New packages cannot be created from this field; users must pick an existing one.

It touches the package level records of transfers (stock.package_level) and their move lines, and relies on standard stock data such as packages, locations and companies. No new menus, reports or scheduled actions are added.