[FIX] l10n_ar_account_withholding: trying to avoid

closes #795

Signed-off-by: pablohmontenegro <pam@adhoc.com.ar>

l10n_ar_account_withholding/models/account_tax.py

@@ -258,7 +258,10 @@ def _compute_amount(
             self, base_amount, price_unit, quantity=1.0, product=None, partner=None, fixed_multiplicator=1):
         if self.amount_type == 'partner_tax':
             date = self._context.get('invoice_date', fields.Date.context_today(self))
-            if not date:
+
+            # Parche para intentar que al intentar corregir el problema que surge al intentar consultar la alicuota
+            # para la fecha que estamos usando para forzar la actualizacion de la cotizacion
+            if not date or str(date) == '1970-01-01':
                 date = fields.Date.context_today(self)
             partner = partner and partner.sudo()
             return base_amount * self.sudo().get_partner_alicuota_percepcion(partner, date)