[IMP] stock: improve inv. adj. line constraint
[IMP] stock: improve inv. adj. line constraint

The constraint avoifding ot have two inventory lines with the same
properties was only triggered in the create, we make it work also in the
write.

TASK-30921

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo