[FIX] mrp_subcontracting: changing UoM causes unreserve issues

Before this commit:
It was possible to purchase a subcontracted product and on the receipt of the product, change the unit of measure o on the stock move lines of the components when the quantities were already reserved.
This caused unreserve issue given that, all of a sudden, instead of having 200g, we would have 200kg reserved and the change would not be reflected on the quant.

After this commit:
The view was modified to not allow changes of UoM if there are reserved quantities, or if the state is done.

OPW-3742720

closes odoo#154327

Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/mrp_subcontracting/views/stock_move_views.xml

@@ -26,7 +26,8 @@
                 <field name="qty_done" 
                     decoration-warning="product_uom_qty &lt; qty_done"
                     decoration-success="product_uom_qty == qty_done"/>
-                <field name="product_uom_id" groups="uom.group_uom"/>
+                <field name="product_uom_id" options="{'no_open': True, 'no_create': True}" string="Unit of Measure" groups="uom.group_uom"
+			        attrs="{'readonly': ['|', ('product_uom_qty', '!=', 0.0), '&amp;', ('state', '=', 'done'), ('id', '!=', False)]}"/>
             </tree>
         </field>
     </record>