partner_vat_unique
Ensure customer and supplier VAT numbers remain unique via an optional enforceable constraint.
Key Features
- res.partner: Prevents VAT numbers from being copied when duplicating partners.
- res.partner: Enforces VAT uniqueness among parent-level partners when enabled, ignoring empty VATs and child contacts.
- res.config.settings: Adds a Contacts setting to toggle the unique VAT constraint.