raiseValidationError(_('You try to assign a eater to a worker but this easer is alread assign to %s please remove it before')%self.parent_eater_id.name)
raiseValidationError(_('You try to assign a eater to a worker but this eater is already assign to %s please remove it before')%rec.parent_eater_id.name)
# replace many2many command when writing on child_eater_ids to just remove the link