Hi,

The product is referenced in some another tables, that's why you are not able to delete the product. So if you really need to delete this product, you have to delete it from the places where it is referenced, as per the error message that you get the product is used in the table stock.valuation.layer , so you have to remove it first and then delete the product.

Or easily instead of deleting you can set Archive the record, which brings almost same functionality of delete.

Thanks