Invoice Production Lots

This module adds traceability information to customer invoices. On every invoice line of an account.move, a new "Production Lots" field lists the lots or serial numbers that were actually delivered for that line, taken from the linked stock moves. The information is computed automatically, so users do not have to type it.

Where it appears: - In the invoice form, inside each invoice line, a "Production Lots" section shows the related lots or serial numbers. - On the printed invoice report, the lot information is added next to the line description.

Business rules and behaviour shown in the code: - For products tracked by serial number, the report prints the serial numbers on the line ("S/N: ..."). - For products tracked by lot, the report adds a block listing each lot name together with the delivered quantity for that lot. - The lot information is only visible to users who have access to the production lot feature (the stock lot group).

The module touches account.move.line (new computed field and a helper that groups lots by quantity) and extends the invoice form view and the invoice report template. It relies on the link between invoices and stock moves provided by the sale, stock and invoice link modules.