PoS Product packaging container deposit

This module brings container deposit handling into the Point of Sale. It relies on the packaging configuration from the product packaging container deposit module, where each packaging type can be linked to a deposit product.

In the Point of Sale screen, when a cashier scans a product barcode that corresponds to a packaging, the system looks up the packaging and automatically adds the related container deposit product as a separate order line. The deposit quantity is calculated from the number of packages sold, so if the customer buys three bottles in a crate, the deposit line is set for three crates.

If the cashier later changes the quantity of the sold product, the deposit line quantity is updated automatically. If the product line is removed, the deposit line is removed as well. This keeps the deposit charge in line with what the customer actually takes away.

On the technical side, the module adds a flag on Point of Sale order lines to mark deposit lines, and it makes the deposit product configured on the packaging available to the Point of Sale session. It also extends the product packaging model so the deposit product can be read from the packaging type. No new menus or reports are added; the behaviour appears directly in the Point of Sale order screen.