Product Category multi-company

This module makes product categories multi-company aware. On the Product Category form, the single Company field is hidden and replaced by a Companies field (visible to users with multi-company rights) where you can tag several companies at once.

It adds automatic consistency checks: - A product's companies must be a subset of the companies of its category; otherwise Odoo refuses to save. - You cannot remove companies from a category if products in it still belong to companies outside the new list. - A child category must share the same companies as its parent category. - A parent category must be shared with all the companies of its child categories.

These rules apply on product.category and product.template, so they trigger whenever you change the companies of a category or product, or move a product to another category. When a rule is broken, Odoo shows a clear error message naming the parent and child categories or the companies involved, and the change is not saved.