Todos los porductos deben ser exentos

models/account_invoice.py

@@ -113,6 +113,8 @@ class Exportacion(models.Model):
             return super(Exportacion, self)._totales_normal(currency_id, MntExe,
                                                             MntNeto, IVA, TasaIVA,
                                                             MntTotal, MntBase)
+        if IVA > 0 or MntExe == 0:
+            raise UserError("Deben ser todos los productos Exentos!")
         Totales = {}
         if currency_id:
             Totales['TpoMoneda'] = currency_id.abreviatura
@@ -165,13 +167,14 @@ class Exportacion(models.Model):
         #if not in 3,4,5
         if self.payment_term_id:
             Aduana['CodModVenta'] = self.payment_term_id.forma_pago_aduanas.code
-            mnt_clau = self.payment_term_id.with_context(currency_id=self.currency_id.id).compute(
-                self.amount_total, date_ref=self.date_invoice)[0]
-            Aduana['TotClauVenta'] = round(mnt_clau[0][1], 2)
         elif not self._es_nc_exportacion():
             raise UserError("Debe Ingresar un Término de Pago")
         if self.incoterms_id:
             Aduana['CodClauVenta'] = self.incoterms_id.aduanas_code
+        if self.payment_term_id:
+            mnt_clau = self.payment_term_id.with_context(currency_id=self.currency_id.id).compute(
+                self.amount_total, date_ref=self.date_invoice)[0]
+            Aduana['TotClauVenta'] = round(mnt_clau[0][1], 2)
         if expo.via:
             Aduana['CodViaTransp'] = expo.via.code
         if expo.chofer_id: