diff --git a/addons/account/models/account_payment_term.py b/addons/account/models/account_payment_term.py
index c6f25724890..27f7336840e 100644
--- a/addons/account/models/account_payment_term.py
+++ b/addons/account/models/account_payment_term.py
@@ -278,12 +278,6 @@ class AccountPaymentTermLine(models.Model):
             if term_line.value == 'percent' and (term_line.value_amount < 0.0 or term_line.value_amount > 100.0):
                 raise ValidationError(_('Percentages on the Payment Terms lines must be between 0 and 100.'))
 
-    @api.constrains('nb_days')
-    def _check_positive(self):
-        for term_line in self:
-            if term_line.nb_days < 0:
-                raise ValidationError(_('The Months and Days of the Payment Terms lines must be positive.'))
-
     @api.depends('payment_id')
     def _compute_days(self):
         for line in self: