[qty and uom must change with partial delivery]

Hello,

With this fix , quantity and unit of measure will be change. when we perform partial delivery 

Thanks.
Hello,

with other test, this line is not compatible with reception.

To reproduce the problem:
- Use should have the group "Manage Multiple Units of Measure"
- In demo data there is the product "Ham" with a Unit of Sale in kg
- Create a PO with this product
- Try to receive this product via "Incoming Products" and the "Deliver/Receives product" (in more).

-> result there is an error message : "Conversion from Product UoM kg to Default UoM Unit(s) is not possible as they both belong to different Category!."