Partner Rank Commercial Entity

This module changes how customer and supplier ranks behave on contacts in Odoo. Normally each contact keeps its own customer rank and supplier rank. With this module, those two fields are treated as commercial fields, meaning they belong to the main commercial entity (the parent company contact) rather than to each individual contact.

What changes for users:

• When a rank is increased on a contact, the increase is applied to the main commercial entity instead of only that contact.
• The updated rank values are then synchronised down to all child contacts of that entity, so every contact under the same company shows the same customer rank and supplier rank.
• Because the fields are commercial fields, Odoo's standard commercial-field synchronisation also keeps them aligned across the entity.

The module touches the res.partner model and depends on account, which is where the customer and supplier rank fields come from. It does not add new menus, screens, buttons or reports; the change is visible directly in the rank values shown on partner records. No new scheduled actions, emails or validation rules are introduced by the code shown.