This update adds three new fields to Odoo invoice PDFs – Buyer Reference, Contract Reference, and Purchase Order Reference – to ensure compliance with Chorus Pro requirements. These fields allow users to accurately document key purchase information directly on the invoice, simplifying the invoicing process for Chorus Pro clients.

This commit:
- Add three reference fields to invoice PDF for Chorus Pro compliance: Buyer Reference, Contract Reference, and Purchase Order Reference. These fields appear in the invoice header when set on the invoice.

task-5410836

Forward-Port-Of: odoo/odoo#240494