diff --git a/source/app/controllers/pacs/cfdi_cert.py b/source/app/controllers/pacs/cfdi_cert.py
index 4c3a0a2..fe1cf61 100644
--- a/source/app/controllers/pacs/cfdi_cert.py
+++ b/source/app/controllers/pacs/cfdi_cert.py
@@ -162,16 +162,15 @@ class SATCertificate(object):
 
         node = xmlsec.tree.find_node(tree, 'X509Certificate')
         node.text = self.cer_txt
-        node = xmlsec.tree.find_node(tree, 'X509IssuerName')
-        node.text = self.issuer
+        # ~ node = xmlsec.tree.find_node(tree, 'X509IssuerName')
+        # ~ node.text = self.issuer
         node = xmlsec.tree.find_node(tree, 'X509SerialNumber')
-        node.text = self.serial_number2
-        node = xmlsec.tree.find_node(tree, 'SignatureValue')
-        node.text = node.text.replace('\n', '')
+        node.text = self.serial_number
+        # ~ node = xmlsec.tree.find_node(tree, 'SignatureValue')
+        # ~ node.text = node.text.replace('\n', '')
 
-        xml_signed = ET.tostring(
-            tree, encoding='utf-8', xml_declaration=True).decode()
-        # ~ xml_signed = xml_signed.replace("'", '"').replace('utf', 'UTF')
+        xml_signed = ET.tostring(tree,
+            xml_declaration=True, encoding='UTF-8').decode()
 
         return xml_signed
 
diff --git a/source/app/controllers/utils.py b/source/app/controllers/utils.py
index 0a8f147..c8ff49c 100644
--- a/source/app/controllers/utils.py
+++ b/source/app/controllers/utils.py
@@ -682,7 +682,7 @@ def _cancel_with_cert(invoice, auth, certificado):
 
 
 def cancel_xml_sign(invoice, auth, certificado):
-    return _cancel_with_cert(invoice, auth, certificado)
+    # ~ return _cancel_with_cert(invoice, auth, certificado)
 
     cert = SATCertificate(certificado.cer, certificado.key_enc.encode())
     pac = PACS[auth['pac']]()
diff --git a/source/app/settings.py b/source/app/settings.py
index 7b4a3ff..524bc21 100644
--- a/source/app/settings.py
+++ b/source/app/settings.py
@@ -250,32 +250,37 @@ DEFAULT_GLOBAL = {
     'clave_sat': '01010101',
 }
 
-TEMPLATE_CANCEL = """<Cancelacion xmlns="http://cancelacfd.sat.gob.mx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Fecha="{fecha}" RfcEmisor="{rfc}">
-    <Folios>
-        <UUID>{uuid}</UUID>
-    </Folios>
-    <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
-        <SignedInfo>
-            <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
-            <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
-            <Reference URI="">
-                <Transforms>
-                    <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
-                </Transforms>
-                <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
-                <DigestValue/>
-            </Reference>
-        </SignedInfo>
-        <SignatureValue/>
-        <KeyInfo>
-            <X509Data>
-                <X509IssuerSerial>
-                    <X509IssuerName/>
-                    <X509SerialNumber/>
-                </X509IssuerSerial>
-                <X509Certificate/>
-            </X509Data>
-        </KeyInfo>
-    </Signature>
-</Cancelacion>
-"""
+TEMPLATE_CANCEL = """<Cancelacion xmlns="http://cancelacfd.sat.gob.mx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" RfcEmisor="{rfc}" Fecha="{fecha}">
+  <Folios>
+    <UUID>{uuid}</UUID>
+  </Folios>
+  <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
+    <SignedInfo>
+      <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
+      <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
+      <Reference URI="">
+        <Transforms>
+          <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
+        </Transforms>
+        <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
+        <DigestValue/>
+      </Reference>
+    </SignedInfo>
+    <SignatureValue/>
+    <KeyInfo>
+      <X509Data>
+        <X509IssuerSerial>
+          <X509IssuerName/>
+          <X509SerialNumber/>
+        </X509IssuerSerial>
+        <X509Certificate/>
+      </X509Data>
+      <KeyValue>
+        <RSAKeyValue>
+          <Modulus/>
+          <Exponent/>
+        </RSAKeyValue>
+      </KeyValue>
+    </KeyInfo>
+  </Signature>
+</Cancelacion>"""
diff --git a/source/xslt/cadena.xslt b/source/xslt/cadena.xslt
index 7cf2b91..f77402c 100644
--- a/source/xslt/cadena.xslt
+++ b/source/xslt/cadena.xslt
@@ -15,6 +15,7 @@
   <xsl:include href="pagos10.xslt"/>
   <xsl:include href="divisas.xslt"/>
   <xsl:include href="servicioconstruccion.xslt"/>
+  <xsl:include href="cartaporte20.xslt"/>
 
 <!--
   <xsl:include href="ecc11.xslt"/>
diff --git a/source/xslt/cartaporte20.xslt b/source/xslt/cartaporte20.xslt
new file mode 100644
index 0000000..e69de29