I tried adding a model constraint of type 'u' from Settings -> Database Structure -> Model constraints to res.partner's base module. But there was no way to specify column/field name to which the constraint should apply ?
I hope there is a way to add constraint without altering any Odoo code.
Any suggestions ?
I think there is no option to add constraint from back end.
Will adding/updating ir.model.constraint work without creating any other issue ?