diff -rupN electronic_invoice_dian.orig/__manifest__.py electronic_invoice_dian.patch/__manifest__.py
--- electronic_invoice_dian.orig/__manifest__.py	2021-09-22 18:22:44.527545853 -0500
+++ electronic_invoice_dian.patch/__manifest__.py	2021-09-23 12:44:10.531259879 -0500
@@ -13,7 +13,7 @@
     'category': 'Accounting/Accounting',
     'version': '14.0.0.0',
     'depends': ['account', 'sale'],
-    'license': 'OEEL-1',
+    'license': '',
     'installable': True,
     'data': [
         'data/data.xml',
diff -rupN electronic_invoice_dian.orig/models/account_move.py electronic_invoice_dian.patch/models/account_move.py
--- electronic_invoice_dian.orig/models/account_move.py	2021-09-22 18:22:44.527545853 -0500
+++ electronic_invoice_dian.patch/models/account_move.py	2021-09-23 12:51:07.934868234 -0500
@@ -220,7 +220,7 @@ class AccountMove(models.Model):
             "id_param": str(journal.resolution_id.id_param),
             "test": "0",
             "ambiente": "1" if company.ei_environment == 'production' else "2",
-            "ruta_to_soap": ("SendBillSync"
+            "ruta_to_soap": ("SendBillAttachmentAsync"
                              if company.ei_environment == 'production'
                              else "SendTestSetAsync")
         }
@@ -276,7 +276,7 @@ class AccountMove(models.Model):
                               if is_colombia(partner_country) else ""),
             "RUT_direcci\u00f3n": invoice_partner.street,
             "RUT_impuesto": "01",
-            "Respon_fiscales": "",
+            "Respon_fiscales": "O-13",
             "Num_matricula_mercantil": "",
             "Nombre_contacto": invoice_partner.name,
             "Tel_contacto": invoice_partner.phone,
@@ -300,7 +300,7 @@ class AccountMove(models.Model):
             "RUT_municipio": "",
             "RUT_direcci\u00f3n": "",
             "RUT_impuesto": "",
-            "Respon_fiscales": "",
+            "Respon_fiscales": "O-13",
             "Num_matricula_mercantil": "",
             "Nombre_contacto": "",
             "Tel_contacto": "",
@@ -621,7 +621,7 @@ class AccountMove(models.Model):
 
     def valid_email_address(self):
         regex = r'(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)'
-        emails = self.partner_id.email or ''
+        emails = self.partner_id.ei_email or self.partner_id.email or ''
         email_list = emails.split(';')
         return list(filter(
             lambda email: re.match(regex, email),
@@ -642,7 +642,7 @@ class AccountMove(models.Model):
                 continue
             email_pool = email_pool + email
             invoice.create_transaction_log(invoice, 'email_sent', 'OK')
-            invoice.ei_email_sent = True
+            invoice.sudo().ei_email_sent = True
         if force_send:
             email_pool.send()
 
diff -rupN electronic_invoice_dian.orig/templates/customer_acknowledge_email.xml electronic_invoice_dian.patch/templates/customer_acknowledge_email.xml
--- electronic_invoice_dian.orig/templates/customer_acknowledge_email.xml	2021-09-22 18:22:44.527545853 -0500
+++ electronic_invoice_dian.patch/templates/customer_acknowledge_email.xml	2021-09-22 18:50:59.214220403 -0500
@@ -6,7 +6,7 @@
             <field name="email_from">${object.company_id.email or ''}</field>
             <field name="subject">${object.company_id.partner_id.ref_num};${object.company_id.partner_id.name};${object.name};${object.journal_id.resolution_id.document_type};${object.company_id.partner_id.name}</field>
             <field name="model_id" ref="account.model_account_move" />
-            <field name="email_to">${(object.partner_id.email or object.partner_id.ei_email)}</field>
+            <field name="email_to">${(object.partner_id.ei_email or object.partner_id.email)}</field>
             <field name="partner_to">${False}</field>
             <field name="auto_delete" eval="True" />
             <field name="body_html">