diff --git a/tests/Resources/retention/with-creditNote.xml b/tests/Resources/retention/with-creditNote.xml
new file mode 100644
index 0000000..6967cb0
--- /dev/null
+++ b/tests/Resources/retention/with-creditNote.xml
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Retention xmlns="urn:sunat:names:specification:ubl:peru:schema:xsd:Retention-1" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2" xmlns:sac="urn:sunat:names:specification:ubl:peru:schema:xsd:SunatAggregateComponents-1" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <ext:UBLExtensions>
+        <ext:UBLExtension>
+            <ext:ExtensionContent/>
+        </ext:UBLExtension>
+    </ext:UBLExtensions>
+    <cbc:UBLVersionID>2.0</cbc:UBLVersionID>
+    <cbc:CustomizationID>1.0</cbc:CustomizationID>
+    <cac:Signature>
+        <cbc:ID>IdFactesol</cbc:ID>
+        <cac:SignatoryParty>
+            <cac:PartyIdentification>
+                <cbc:ID>20101991319</cbc:ID>
+            </cac:PartyIdentification>
+            <cac:PartyName>
+                <cbc:Name><![CDATA[WORTEC S.A.]]></cbc:Name>
+            </cac:PartyName>
+        </cac:SignatoryParty>
+        <cac:DigitalSignatureAttachment>
+            <cac:ExternalReference>
+                <cbc:URI>#SignatureSP</cbc:URI>
+            </cac:ExternalReference>
+        </cac:DigitalSignatureAttachment>
+    </cac:Signature>
+    <cbc:ID>R001-00000006</cbc:ID>
+    <cbc:IssueDate>2018-02-01</cbc:IssueDate>
+    <cac:AgentParty>
+        <cac:PartyIdentification>
+            <cbc:ID schemeID="6">20101991319</cbc:ID>
+        </cac:PartyIdentification>
+        <cac:PartyName>
+            <cbc:Name><![CDATA[WORTEC S.A.]]></cbc:Name>
+        </cac:PartyName>
+        <cac:PostalAddress>
+            <cbc:ID>150140</cbc:ID>
+            <cbc:StreetName><![CDATA[AV. DEL PINAR NRO. 124 INT. 302]]></cbc:StreetName>
+            <cbc:CitySubdivisionName><![CDATA[CHACARILLA DEL ESTANQUE]]></cbc:CitySubdivisionName>
+            <cbc:CityName><![CDATA[LIMA]]></cbc:CityName>
+            <cbc:CountrySubentity>LIMA</cbc:CountrySubentity>
+            <cbc:District>SANTIAGO DE SURCO</cbc:District>
+            <cac:Country>
+                <cbc:IdentificationCode>PE</cbc:IdentificationCode>
+            </cac:Country>
+        </cac:PostalAddress>
+        <cac:PartyLegalEntity>
+            <cbc:RegistrationName><![CDATA[WORTEC SOCIEDAD ANONIMA]]></cbc:RegistrationName>
+        </cac:PartyLegalEntity>
+    </cac:AgentParty>
+    <cac:ReceiverParty>
+        <cac:PartyIdentification>
+            <cbc:ID schemeID="6">20467463684</cbc:ID>
+        </cac:PartyIdentification>
+        <cac:PartyLegalEntity>
+            <cbc:RegistrationName><![CDATA[HEAP LEACHING CONSULTING S.A.C]]></cbc:RegistrationName>
+        </cac:PartyLegalEntity>
+    </cac:ReceiverParty>
+    <sac:SUNATRetentionSystemCode>01</sac:SUNATRetentionSystemCode>
+    <sac:SUNATRetentionPercent>3.00</sac:SUNATRetentionPercent>
+    <cbc:TotalInvoiceAmount currencyID="PEN">21.00</cbc:TotalInvoiceAmount>
+    <sac:SUNATTotalPaid currencyID="PEN">679.00</sac:SUNATTotalPaid>
+    <sac:SUNATRetentionDocumentReference>
+        <cbc:ID schemeID="01">F003-00000001</cbc:ID>
+        <cbc:IssueDate>2018-02-01</cbc:IssueDate>
+        <cbc:TotalInvoiceAmount currencyID="PEN">1000.00</cbc:TotalInvoiceAmount>
+        <cac:Payment>
+            <cbc:ID>1</cbc:ID>
+            <cbc:PaidAmount currencyID="PEN">500.00</cbc:PaidAmount>
+            <cbc:PaidDate>2018-02-01</cbc:PaidDate>
+        </cac:Payment>
+        <sac:SUNATRetentionInformation>
+            <sac:SUNATRetentionAmount currencyID="PEN">15.00</sac:SUNATRetentionAmount>
+            <sac:SUNATRetentionDate>2018-02-01</sac:SUNATRetentionDate>
+            <sac:SUNATNetTotalPaid currencyID="PEN">485.00</sac:SUNATNetTotalPaid>
+            <cac:ExchangeRate>
+                <cbc:SourceCurrencyCode>PEN</cbc:SourceCurrencyCode>
+                <cbc:TargetCurrencyCode>PEN</cbc:TargetCurrencyCode>
+                <cbc:CalculationRate>1.00</cbc:CalculationRate>
+                <cbc:Date>2018-02-01</cbc:Date>
+            </cac:ExchangeRate>
+        </sac:SUNATRetentionInformation>
+    </sac:SUNATRetentionDocumentReference>
+    <sac:SUNATRetentionDocumentReference>
+        <cbc:ID schemeID="07">F003-00000001</cbc:ID>
+        <cbc:IssueDate>2018-02-01</cbc:IssueDate>
+        <cbc:TotalInvoiceAmount currencyID="PEN">500.00</cbc:TotalInvoiceAmount>
+    </sac:SUNATRetentionDocumentReference>
+</Retention>
\ No newline at end of file
diff --git a/tests/Xml/Parser/RetentionParserTest.php b/tests/Xml/Parser/RetentionParserTest.php
index 010cf11..ccde506 100644
--- a/tests/Xml/Parser/RetentionParserTest.php
+++ b/tests/Xml/Parser/RetentionParserTest.php
@@ -33,7 +33,7 @@ public function testParseDoc($filename)
             $this->assertNotEmpty($detail->getTipoDoc());
             $this->assertNotEmpty($detail->getNumDoc());
             $this->assertNotNull($detail->getFechaEmision());
-            $this->assertGreaterThan(0, count($detail->getPagos()));
+            $this->assertTrue(is_array($detail->getPagos()));
             $this->assertTrue(is_float($detail->getImpTotal()));
             $this->assertTrue(is_float($detail->getImpRetenido()));
             $this->assertTrue(is_float($detail->getImpPagar()));