Good morning!.

I've recently installed and then uninstalled this module https://www.odoo.com/apps/modules/8.0/product_sequence/

Even after removing it, the constraint NOT NULL over Contact Reference doesn't disappear.

I've entered psql, but I doubt where do I need to remove the constraint and how.

Would be something like this?:

ALTER TABLE product_product DROP CONSTRAINT ref;

Thank you!