PoS Order Margin & Account Invoice Margin

When you invoice a Point of Sale order, Odoo creates invoice lines from the order lines. Without this module, those invoice lines do not know the purchase cost of the product, so the margin on the invoice is wrong.

This module fixes that in two ways:

• For new invoices: each time an invoice line is created from a Point of Sale order line, the purchase price of the order line is copied onto the invoice line. This happens automatically when the invoice is generated from the Point of Sale.
• For existing invoices: when you install the module, a one-time process runs in the background. It looks at all Point of Sale orders that are already invoiced and whose margin is not already complete, finds the related invoice, and fills in the purchase price on each invoice line by matching the product with the order lines. This may take a while if you have many orders.

The module works together with the Point of Sale margin and invoice margin features. It does not add new menus or screens; it only changes how invoice lines are filled in. The models touched are pos.order and, indirectly, the invoice lines created from it.