I created a field many2one field with the following:

light_system = fields.Many2one('product.product', string='Lighting System', ondelete='restrict')

When I restart the server I get:

WARNING newtest openerp.fields: Field jobsite.details.light_system with unknown comodel_name 'product.product'

And when I try to select a product in the form it fails with:

ProgrammingError: relation "_unknown" does not exist

LINE 1: SELECT "_unknown".id FROM "_unknown" ORDER BY "_unknown"."id...

I have a many2one field with the res.users in the same model and that works fine, this one with either product.product or product.template fails. What am I missing?

Any help will be greatly appreciated