Hello guys, well, I created inside Odoo a field "x_dept" inside res.partner, and I used it for a form view and a search view, but when I tried update mail module I get a error about "x_dept" does not exist, then I decided create a inherit of res.partner and add the field, but when I try delete the "x_dept" field my Odoo breaks, first I delete the field in form and search view, and then I deleted it from res.partner model but my Odoo breaks again.

Could anyone help me? Thanks!