Dears when i try to close a pos sessions i always get an error 

The unit of measure Units defined on the order line doesn't belong to the same category as the unit of measure kg defined on the product. Please correct the unit of measure defined on the order line or on the product, they should belong to the same category.

i have checked a million time on more than 16000+ order lines also checked through the database with sql scripts and no conflict in the UOM found between the product uom and order line product uom

anyone have this issue before

it is odoo 16 enterprise version