Please pass the "exclude_from_invoice_tab: False" in the invoice values and try it again.

Hi Ahmad,

Please override the _check_balance method of 'account.move' by returning True.

def _check_balanced(self):
        return True

Once the script execution is completed, remove the _check_balanced (override) method so the Odoo flow will not be affected in normal(form view) invoice creation.

Thanks

When Niyas Raphy said

 Hi,

Pass check_move_validity as False in the context and try.

He said that you have to put on the invoice a context before you can change the quantity of the lines, just like this.

invoice = self.env['account.move'].create({}) //Supose I create an invoice here

invoice = invoice.with_context(check_move_validity=False,)

Caution! This change work when invoice is a sale invoice!

I proof this and The result has been correct.

I hope this help you, I pass 3 hours with this.