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Pawan Kumar Sharma India

--Pawan Kumar Sharma--
SunArc Technologies
| 6 4 7
Gangashahar(Bikaner), India
--Pawan Kumar Sharma--

Pawan Kumar Sharma India
10/25/17, 7:44 AM

Problem Solved.

I added constrain, that return a warning;

from openerp.exceptions import ValidationError

    @api.constrains('wizard')  # wizard is the one2many field
    def _check_grade_choisi(self):
        for record in self:
            l = []
            if not any([s.check_box for s in record.wizard]) : #Here i check if all checkbox field is False
                raise ValidationError("Your warning")

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