Package multi reference

On the package form you get a new editable list called References, where you can add as many reference values as you need and reorder them with a drag handle. The package's own Package Reference field is now read-only on the form and always shows the first reference in that list, so the rest of Odoo keeps working with a single main reference.

• Adding, changing or removing the first reference updates the package reference automatically, and typing a package reference creates the matching first entry in the list.
• Searching packages by reference also looks inside the whole reference list, so a package can be found by any of its references, not only the main one.
• A reference value cannot be used twice: if you try to save a reference that already exists on another package, Odoo blocks it with an error showing the existing package and company.
• When the module is installed, existing packages are given a first reference entry built from their current name.

It works on the package model stock.quant.package and adds a new reference model stock.quant.package.reference, with access for all internal users. The change appears on the standard package form in Inventory.