diff --git a/sii/resource.py b/sii/resource.py
index fe42f24..caa3b27 100644
--- a/sii/resource.py
+++ b/sii/resource.py
@@ -92,6 +92,9 @@ def get_iva_values(invoice, in_invoice, is_export=False, is_import=False):
                 continue
             else:
                 vals['sujeta_a_iva'] = True
+                if is_export:
+                    vals['sujeta_a_iva'] = False
+                    vals['detalle_iva_exento']['BaseImponible'] += base_imponible
                 invoice_total -= (base_imponible + cuota)
 
             tax_type = inv_tax.tax_id.type
@@ -109,7 +112,7 @@ def get_iva_values(invoice, in_invoice, is_export=False, is_import=False):
             # detectan como IVA exento
             elif not is_export and not is_import and is_iva_exento:
                 vals['iva_exento'] = True
-                vals['detalle_iva_exento']['BaseImponible'] += inv_tax.base
+                vals['detalle_iva_exento']['BaseImponible'] += base_imponible
             else:
                 if in_invoice:
                     cuota_key = 'CuotaSoportada'
diff --git a/spec/serialization_spec.py b/spec/serialization_spec.py
index 44c1d53..530f3a0 100644
--- a/spec/serialization_spec.py
+++ b/spec/serialization_spec.py
@@ -345,30 +345,28 @@ def group_by_tax_rate(iva_values, in_invoice):
                     detalle_iva = (
                         self.factura_emitida['FacturaExpedida']['TipoDesglose']
                         ['DesgloseTipoOperacion']['Entrega']['Sujeta']
-                        ['NoExenta']['DesgloseIVA']['DetalleIVA']
-                    )
-                    self.grouped_detalle_iva = group_by_tax_rate(
-                        detalle_iva, in_invoice=False
+                        ['Exenta']['DetalleExenta']
                     )
+                    self.detalle_iva = detalle_iva
 
                 with it('la BaseImponible debe ser la original'):
+                    total_base = sum([x.base for x in self.out_invoice.tax_line if 'IVA' in x.name])
                     expect(
-                        self.grouped_detalle_iva[21.0]['BaseImponible']
+                        self.detalle_iva['BaseImponible']
                     ).to(equal(
-                        self.out_invoice.tax_line[0].base
+                        total_base
                     ))
-                with it('la CuotaRepercutida debe ser la original'):
+                with it('la Causa Exención tiene que ser E2'):
                     expect(
-                        self.grouped_detalle_iva[21.0]['CuotaRepercutida']
-                    ).to(equal(
-                        self.out_invoice.tax_line[0].tax_amount
-                    ))
-                with it('el TipoImpositivo debe ser la original'):
+                        self.detalle_iva['CausaExencion']
+                    ).to(equal('E2'))
+                with it('No lleva ni tipo impositivo ni Cuota'):
                     expect(
-                        self.grouped_detalle_iva[21.0]['TipoImpositivo']
-                    ).to(equal(
-                        self.out_invoice.tax_line[0].tax_id.amount * 100
-                    ))
+                        self.detalle_iva.get('TipoImpositivo','NOTEXIST')
+                    ).to(equal('NOTEXIST'))
+                    expect(
+                        self.detalle_iva.get('CuotaRepercutida','NOTEXIST')
+                    ).to(equal('NOTEXIST'))
 
         with context('si es una operación de alquiler (CRE "12" o "13")'):
             with before.all: