Every week I place Purchase orders with various suppliers.

Each order is made of say 20 different lines with 1 line per ordered product.

some lines for already existing productss, others for non existing products;

I have no way to predict i one product is already existing of not; hence the risk to duplicate products.

My odoo db contains say 20 000 unique products

when Importing the order lines from documents (csv files) received from suppliers, Odoo is able to create new product on the fly (for instance on the criteria Name).

This criteria is weak  as it is not (apparently ) able to REFUSE the import of a order line when the name is misspelled ((spelling errors etc...)

How to instruct ODOO to manage unique skus numbers?