How to raise error when unit amount is 0 in Expense Module

Question

In an expense record, the unit amount value must never be 0.00. Hence,  I want an error to be raised when the unit amount is 0.00
I added the below code:
@api.onchange('unit_amount')
def write(self):
if self.unit_amount == 0.00:
raise UserError(_('You are not allowed to create expenses with 0 value'))
The above user error is raised as soon as the Create button is clicked because, unit amount value is by default set as as 0.00
Please provide an alternate suggestion

Alpesh Valaki · Accepted Answer

you can use api.constrains
see below code.
@api.constrains('unit_amount')
def check_unit_amount(self):
if self.unit_amount <= 0:
raise UserError("You are not allowed to create expenses with 0 value")

Thanks.

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