[FIX] account: fix forward port bug induced by 6466aa499f

addons/account/models/account_invoice.py

@@ -1362,7 +1362,7 @@ class AccountInvoiceTax(models.Model):
             if tax.invoice_id and key in tax_grouped[tax.invoice_id.id]:
                 tax.base = tax_grouped[tax.invoice_id.id][key]['base']
             else:
-                _logger.warning('Tax Base Amount not computable probably due to a change in an underlying tax (%s).', tax.tax_id.name)
+                tax.base = 0.0
 
     invoice_id = fields.Many2one('account.invoice', string='Invoice', ondelete='cascade', index=True)
     name = fields.Char(string='Tax Description', required=True)

addons/account/tests/test_account_customer_invoice.py

@@ -61,6 +61,7 @@ class TestAccountCustomerInvoice(AccountTestUsers):
             'amount': 9050,
             'account_id': self.ova.id,
             'invoice_id': self.account_invoice_customer0.id,
+            'tax_id': self.env['account.tax'].search([('type_tax_use', '=', 'sale')], limit=1).id
         }
         tax = self.env['account.invoice.tax'].create(invoice_tax_line)
         assert tax, "Tax has not been assigned correctly"