Commissions in contract invoices

This module connects contracts with the sales commission feature. When Odoo generates an invoice from a contract, each invoice line now automatically receives the commission agents that are set up for the contract's customer.

• It works in the background: no new menu or button is added.
• The commission agents are taken from the customer of the contract, so the same default agents used in regular sales documents are applied.
• This affects the contract.line model when it prepares the values for the invoice line, and the resulting account.invoice.line records.
• The module installs automatically when both the Contracts and Sales Commissions modules are present.

In practice, users who create recurring invoices from contracts no longer need to manually add commission agents to each invoice line; the commissions are filled in automatically based on the customer's configuration.