[16.0] mrp_bom_line_formula_quantity: quantity doesn't multiply if more than one product produced

[DavideSpagnuolo]

Module

mrp_bom_line_formula_quantity

Bug

When I want to produce more than 1 product with the configured BOM, the system doesn't multiply the quantity of the components in which the quantity is determined in the quantity forula field.

To reproduce
Affected version: 16.0

Step to reproduce the bug:

1. Create a new BOM for the product X
2. Add a component Y to the BOM
3. Configure the quantity formula (i.e. quantity = 2)
4. Save and exit
5. Create a new work order for more than one unit of product X (from a sale order or directly from the manifacturing app, it's the same)
6. Odoo, for the component Y, doesn't multiply the quantity resulting from the quantity formula by the quantity of product X needed (i.e. WO for 2 units of product X -> the quantity for component Y is not 4, but remains 2)

Expected behavior
Odoo, for the component Y, shows the correct quantity calculated as the quantity resulting from the quantity formula by the quantity of product X needed (i.e. WO for 2 units of product X -> the quantity for component Y is 4)

[techgrrow]

Proposed a PR for this issue #1463