diff --git a/facho/fe/fe.py b/facho/fe/fe.py
index 64e05b7..b523e80 100644
--- a/facho/fe/fe.py
+++ b/facho/fe/fe.py
@@ -13,6 +13,7 @@ import hashlib
 from contextlib import contextmanager
 from .data.dian import codelist
 from . import form
+from collections import defaultdict
 
 AMBIENTE_PRUEBAS = codelist.TipoAmbiente.by_name('Pruebas')['code']
 AMBIENTE_PRODUCCION = codelist.TipoAmbiente.by_name('Producción')['code']
@@ -97,7 +98,7 @@ class DianXMLExtensionCUDFE(FachoXMLExtension):
         raise NotImplementedError()
 
     def build(self, fachoxml):
-        cufe = self._generate_cufe(fachoxml)
+        cufe = self._generate_cufe()
         fachoxml.set_element('./cbc:UUID', cufe,
                              schemeID=self.tipo_ambiente,
                              schemeName=self.schemeName())
@@ -122,7 +123,7 @@ class DianXMLExtensionCUDFE(FachoXMLExtension):
         # PAG 601
         build_vars['ValorBruto'] = invoice.invoice_legal_monetary_total.line_extension_amount
         build_vars['ValorTotalPagar'] = invoice.invoice_legal_monetary_total.payable_amount
-        ValorImpuestoPara = {}
+        ValorImpuestoPara = defaultdict(lambda: form.Amount(0.0))
         build_vars['CodImpuesto1'] = 1
         build_vars['CodImpuesto2'] = 4
         build_vars['CodImpuesto3'] = 3
@@ -139,9 +140,8 @@ class DianXMLExtensionCUDFE(FachoXMLExtension):
 
         return build_vars
 
-    def _generate_cufe(self, fachoxml):
-        formatVars = self.formatVars()
-        cufe = "".join(formatVars)
+    def _generate_cufe(self):
+        cufe = "".join(self.formatVars())
 
         # crear hash...
         h = hashlib.sha384()
diff --git a/facho/fe/form.py b/facho/fe/form.py
index dab1fda..b5960f4 100644
--- a/facho/fe/form.py
+++ b/facho/fe/form.py
@@ -91,6 +91,7 @@ class Amount:
     def is_same_currency(self, other):
         return self.currency == other.currency
 
+
 @dataclass
 class Item:
     description: str
@@ -348,12 +349,19 @@ class AllowanceCharge:
 
 class NationalSalesInvoiceDocumentType(str):
     def __str__(self):
+        # 6.1.3
         return '01'
 
 class CreditNoteDocumentType(str):
     def __str__(self):
+        # 6.1.3
         return '91'
 
+class DebitNoteDocumentType(str):
+    def __str__(self):
+        # 6.1.3
+        return '92'
+
 class Invoice:
     def __init__(self, type_code: str):
         if str(type_code) not in codelist.TipoDocumento:
@@ -475,3 +483,12 @@ class CreditNote(Invoice):
         if not isinstance(invoice_document_reference, BillingReference):
             raise TypeError('invoice_document_reference invalid type')
         self.invoice_billing_reference = invoice_document_reference
+
+
+class DebitNote(Invoice):
+    def __init__(self, invoice_document_reference: BillingReference):
+        super().__init__(DebitNoteDocumentType())
+
+        if not isinstance(invoice_document_reference, BillingReference):
+            raise TypeError('invoice_document_reference invalid type')
+        self.invoice_billing_reference = invoice_document_reference
diff --git a/facho/fe/form_xml/debit_note.py b/facho/fe/form_xml/debit_note.py
index 3bf367a..c537f2a 100644
--- a/facho/fe/form_xml/debit_note.py
+++ b/facho/fe/form_xml/debit_note.py
@@ -17,7 +17,7 @@ class DIANDebitNoteXML(fe.FeXML):
         ublextension = self.fragment('/fe:DebitNote/ext:UBLExtensions/ext:UBLExtension', append=True)
         extcontent = ublextension.find_or_create_element('/ext:UBLExtension/ext:ExtensionContent')
         self.attach_invoice(invoice)
- 
+
     def set_supplier(fexml, invoice):
         fexml.placeholder_for('/fe:DebitNote/cac:AccountingSupplierParty')
         #DIAN 1.7.-2020: DAJ02
@@ -101,7 +101,7 @@ class DIANDebitNoteXML(fe.FeXML):
                           invoice.invoice_customer.tax_scheme.code)
         #DIAN 1.7.-2020: DAJ41
         fexml.set_element('/fe:DebitNote/cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme/cac:TaxScheme/cbc:Name',
-                          invoice.invoice_customer.tax_scheme.name)                          
+                          invoice.invoice_customer.tax_scheme.name)
         #DIAN 1.7.-2020: DAJ42
         fexml.placeholder_for('/fe:DebitNote/cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity')
         #DIAN 1.7.-2020: DAJ43
@@ -229,7 +229,7 @@ class DIANDebitNoteXML(fe.FeXML):
         #DIAN 1.7.-2020: CAK51, CAK55
         fexml.set_element('/fe:DebitNote/cac:AccountingCustomerParty/cac:Party/cac:Contact/cbc:ElectronicMail',
                           invoice.invoice_customer.email)
-        
+
 
     def set_payment_mean(fexml, invoice):
         payment_mean = invoice.invoice_payment_mean
@@ -275,10 +275,10 @@ class DIANDebitNoteXML(fe.FeXML):
                                 schemeName='CUFE-SHA384')
         fexml.set_element('/fe:DebitNote/cac:BillingReference/cac:InvoiceDocumentReference/cbc:IssueDate',
                                 invoice.invoice_billing_reference.date)
-        
-        
+
+
     def set_invoice_totals(fexml, invoice):
-        tax_amount_for = defaultdict(lambda: defaultdict(lambda: 0.0))
+        tax_amount_for = defaultdict(lambda: defaultdict(lambda: Amount(0.0)))
         percent_for = defaultdict(lambda: None)
 
         #requeridos para CUDE
diff --git a/facho/fe/form_xml/invoice.py b/facho/fe/form_xml/invoice.py
index 3fb05db..63c4fd3 100644
--- a/facho/fe/form_xml/invoice.py
+++ b/facho/fe/form_xml/invoice.py
@@ -416,7 +416,7 @@ class DIANInvoiceXML(fe.FeXML):
             return fexml._set_invoice_document_reference(reference)
 
     def set_invoice_totals(fexml, invoice):
-        tax_amount_for = defaultdict(lambda: defaultdict(lambda: 0.0))
+        tax_amount_for = defaultdict(lambda: defaultdict(lambda: Amount(0.0)))
         percent_for = defaultdict(lambda: None)
 
         #requeridos para CUFE
diff --git a/tests/test_fe_form.py b/tests/test_fe_form.py
index 060ced3..15a6c13 100644
--- a/tests/test_fe_form.py
+++ b/tests/test_fe_form.py
@@ -12,7 +12,39 @@ import zipfile
 
 import facho.fe.form as form
 from facho import fe
-from facho.fe.form_xml import DIANInvoiceXML, DIANCreditNoteXML
+from facho.fe.form_xml import DIANInvoiceXML, DIANCreditNoteXML, DIANDebitNoteXML
+
+@pytest.fixture
+def simple_debit_note_without_lines():
+    inv = form.DebitNote(form.InvoiceDocumentReference('1234', 'xx', datetime.now()))
+    inv.set_period(datetime.now(), datetime.now())
+    inv.set_issue(datetime.now())
+    inv.set_ident('ABC123')
+    inv.set_operation_type('10')
+    inv.set_payment_mean(form.PaymentMean(form.PaymentMean.DEBIT, '41', datetime.now(), '1234'))
+    inv.set_supplier(form.Party(
+        name = 'facho-supplier',
+        ident = form.PartyIdentification('123','', '31'),
+        responsability_code = form.Responsability(['O-07']),
+        responsability_regime_code = '48',
+        organization_code = '1',
+        address = form.Address(
+            '', '', form.City('05001', 'Medellín'),
+            form.Country('CO', 'Colombia'),
+            form.CountrySubentity('05', 'Antioquia'))
+    ))
+    inv.set_customer(form.Party(
+        name = 'facho-customer',
+        ident = form.PartyIdentification('321', '', '31'),
+        responsability_code = form.Responsability(['O-07']),
+        responsability_regime_code = '48',
+        organization_code = '1',
+        address = form.Address(
+            '', '', form.City('05001', 'Medellín'),
+            form.Country('CO', 'Colombia'),
+            form.CountrySubentity('05', 'Antioquia'))
+    ))
+    return inv
 
 @pytest.fixture
 def simple_credit_note_without_lines():
@@ -312,3 +344,54 @@ def test_credit_note_cude(simple_credit_note_without_lines):
     cude = xml_invoice.get_element_text('/fe:CreditNote/cbc:UUID')
     # pag 612
     assert cude == '907e4444decc9e59c160a2fb3b6659b33dc5b632a5008922b9a62f83f757b1c448e47f5867f2b50dbdb96f48c7681168'
+
+
+# pag 614
+def test_debit_note_cude(simple_debit_note_without_lines):
+    simple_invoice = simple_debit_note_without_lines
+    simple_invoice.invoice_ident = 'ND1001'
+    simple_invoice.invoice_issue = datetime.strptime('2019-01-18 10:58:00-05:00', '%Y-%m-%d %H:%M:%S%z')
+    simple_invoice.invoice_supplier.ident = form.PartyIdentification('900197264', '5', '31')
+    simple_invoice.invoice_customer.ident = form.PartyIdentification('10254102', '5', '31')
+    simple_invoice.add_invoice_line(form.InvoiceLine(
+        quantity = 1,
+        description = 'producto',
+        item = form.StandardItem('test', 111),
+        price = form.Price(form.Amount(30_000), '01', ''),
+        tax = form.TaxTotal(
+            subtotals = [
+                form.TaxSubTotal(
+                    tax_scheme_ident = '04',
+                    percent = 8.0
+                )])
+    ))
+
+    simple_invoice.calculate()
+    xml_invoice = DIANDebitNoteXML(simple_invoice)
+
+    cude_extension = fe.DianXMLExtensionCUDE(
+        simple_invoice,
+        '10201',
+        tipo_ambiente = fe.AMBIENTE_PRUEBAS,
+    )
+    build_vars = cude_extension.buildVars()
+    assert build_vars['NumFac'] == 'ND1001'
+    assert build_vars['FecFac'] == '2019-01-18'
+    assert build_vars['HoraFac'] == '10:58:00-05:00'
+    assert build_vars['ValorBruto'] == form.Amount(30_000)
+    assert build_vars['NitOFE'] == '900197264'
+    assert build_vars['NumAdq'] == '10254102'
+    assert build_vars['ValorImpuestoPara'][1] == form.Amount(0)
+    assert build_vars['ValorImpuestoPara'][4] == form.Amount(2400)
+    assert build_vars['ValorImpuestoPara'][3] == form.Amount(0)
+    assert build_vars['ValorTotalPagar'] == form.Amount(32400)
+    assert build_vars['Software-PIN'] == '10201'
+    assert build_vars['TipoAmb'] == 2
+
+
+    cude_composicion =  "".join(cude_extension.formatVars())
+    assert cude_composicion == 'ND10012019-01-1810:58:00-05:0030000.00010.00042400.00030.0032400.0090019726410254102102012'
+
+    xml_invoice.add_extension(cude_extension)
+    cude = xml_invoice.get_element_text('/fe:DebitNote/cbc:UUID')
+    assert cude == 'b9483dc2a17167feedf37b6bd67c4204e7b601933e0e389cffbd545e4d0ec370b403cbb41ff656776cb6cb5d8348ecd4'