Purchase Stock Vendor Bill Product Breakdown

This is a small bridge module that connects two existing features: the vendor bill product breakdown on purchase orders and the stock/inventory application. It installs automatically when both are present, so users do not need to enable it manually.

The only visible behaviour is automatic: when the received quantity on a purchase order line is updated (for example after a receipt is validated in the warehouse), the module checks whether that line has breakdown components and a received quantity. If so, it recalculates the quantity of each component based on the newly received quantity minus what was already invoiced.

In practice, this keeps the component breakdown lines aligned with what was actually received from the supplier, without the user having to edit them by hand. It touches the purchase.order.line model and works together with the component lines managed by the vendor bill breakdown module.

No new menus, screens, reports, emails or scheduled jobs are added by this module. It only adds this automatic synchronisation between receipts and the breakdown components.