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Hello,

I'm working on constraints for loan lines if the new entered date is less than the dedication start data user validation error must be raised

here's my function:


@api.onchange("loan_lines")
def edit_installment(self):
for loan in self:
for line in loan.loan_lines:
for i in list(line.date):
                 if i < line.date
        print(line.date)
        print(type(line.date))
    raise ValidationError(
_("you can not change the date to date before the start date of dedication"))


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