[FIX] mrp: use MO's UoM on unbuild order creation

On unbuild order creation, when the user selects a manufacturing order,
the UoM of the quantity will be defined with the product's UoM instead
of MO's UoM.

To reproduce the error:
(Use demo data)
1. In Settings > General Settings, enable "Units of Measure"
2. Create two products P_finished and P_compo
    - Both are storable
    - Qty on Hand of P_compo = 12
3. Create a Bill of Material
    - Product: P_finished
    - Component: 1 x P_compo
4. Create a Manufacturing Order MO
    - Product: P_finished
    - Quantity To Produce: 1 Dozen(s)
5. Check Availability, Produce, Mark as Done
6. Create an Unbuild Order:
    - Manufacturing Order: MO

Error: The unit of measure of the quantity is incorrect, this is
Unit(s), it should be Dozen(s)

The method `onchange_mo_id` defines the product, therefore the method
`onchange_product_id` is also called and here is the issue:
`onchange_product_id` will override the UoM using the product's UoM.

OPW-2467017

closes odoo/odoo#70904

X-original-commit: b80321acd5553466862b5c2c56cff014765ecf99
Signed-off-by: William Henrotin <Whenrow@users.noreply.github.com>
Signed-off-by: Adrien Widart <adwid@users.noreply.github.com>

0 files changed, 0 insertions, 0 deletions