Dear all

I want to restrict account Budget entries on the basis of practical_amount exceeds planned _amount.

I have created new selection filed for budget type as flexible & strict in budget form. using onchange fuction for selection of strict budget filed need to restrict entries if it exceeded with warning.

class CrossoveredBudget(models.Model):
    _inherit = "crossovered.budget"
    budget_type = fields.Selection([('flexible', 'Flexible'), ('strict', 'Strict')],string="Budget Type", required=True)

    @api.onchange("budget_type")
    def change_budget_type(self):
        if self.budget_type == "strict":

raise exceptions.UserError(_(
    'This invoice exceeds the limits set in the Budget, use '
    'another journal in order to validate this invoice'))