diff --git a/facho/fe/form_xml/invoice.py b/facho/fe/form_xml/invoice.py
index 3e6444f..b8f7270 100644
--- a/facho/fe/form_xml/invoice.py
+++ b/facho/fe/form_xml/invoice.py
@@ -662,11 +662,14 @@ class DIANInvoiceXML(fe.FeXML):
                         listURI='http://www.dian.gov.co')
         fexml.set_element('./cbc:DocumentCurrencyCode', 'COP')
         fexml.set_element('./cbc:LineCountNumeric', len(invoice.invoice_lines))
-        fexml.set_element('./cac:%sPeriod/cbc:StartDate' % (fexml.tag_document()),
-                          invoice.invoice_period_start.strftime('%Y-%m-%d'))
+        if fexml.tag_document() == 'Invoice':
+            fexml.set_element('./cac:%sPeriod/cbc:StartDate' % (
+                fexml.tag_document()),
+                              invoice.invoice_period_start.strftime('%Y-%m-%d'))
 
-        fexml.set_element('./cac:%sPeriod/cbc:EndDate' % (fexml.tag_document()),
-                          invoice.invoice_period_end.strftime('%Y-%m-%d'))
+            fexml.set_element('./cac:%sPeriod/cbc:EndDate' % (
+                fexml.tag_document()),
+                              invoice.invoice_period_end.strftime('%Y-%m-%d'))
         fexml.set_billing_reference(invoice)
         fexml.customize(invoice)
         fexml.set_supplier(invoice)