diff --git a/locale/de.po b/locale/de.po
index 8eed6b4..c8098e7 100644
--- a/locale/de.po
+++ b/locale/de.po
@@ -35,6 +35,22 @@ msgid "X-Rechnung Route-ID"
 msgstr "X-Rechnung Leitweg-ID"
 
 
+###############
+# party.party #
+###############
+msgctxt "view:party.party:"
+msgid "X-Rechnung"
+msgstr "X-Rechnung"
+
+msgctxt "field:party.party,xrechnung_routeid:"
+msgid "X-Rechnung Route-ID"
+msgstr "X-Rechnung Leitweg-ID"
+
+msgctxt "help:party.party,xrechnung_routeid:"
+msgid "Enables the need for an XRechnung route ID at the party for exporting the XRechnung."
+msgstr "Aktiviert die Notwendigkeit einer XRechnung-Leitweg-ID an der Partei für den Export der XRechnung."
+
+
 ###############
 # account.tax #
 ###############
diff --git a/locale/en.po b/locale/en.po
index fbd1ffb..ab8715b 100644
--- a/locale/en.po
+++ b/locale/en.po
@@ -26,6 +26,18 @@ msgctxt "selection:party.configuration,identifier_types:"
 msgid "X-Rechnung Route-ID"
 msgstr "X-Rechnung Route-ID"
 
+msgctxt "view:party.party:"
+msgid "X-Rechnung"
+msgstr "X-Rechnung"
+
+msgctxt "field:party.party,xrechnung_routeid:"
+msgid "X-Rechnung Route-ID"
+msgstr "X-Rechnung Route-ID"
+
+msgctxt "help:party.party,xrechnung_routeid:"
+msgid "Enables the need for an XRechnung route ID at the party for exporting the XRechnung."
+msgstr "Enables the need for an XRechnung route ID at the party for exporting the XRechnung."
+
 msgctxt "field:account.tax,xrtax_category:"
 msgid "Tax Category"
 msgstr "Tax Category"
@@ -66,3 +78,7 @@ msgctxt "selection:account.tax,xrtax_category:"
 msgid "General indirect tax of the Canary Islands"
 msgstr "General indirect tax of the Canary Islands"
 
+msgctxt "selection:account.tax,xrtax_category:"
+msgid "Tax on production; services and imports in Ceuta and Melilla"
+msgstr "Tax on production; services and imports in Ceuta and Melilla"
+
diff --git a/party.py b/party.py
index d35599b..cc020c6 100644
--- a/party.py
+++ b/party.py
@@ -6,20 +6,48 @@
 from trytond.pool import PoolMeta
 from trytond.exceptions import UserError
 from trytond.i18n import gettext
+from trytond.model import fields
 
 
 class Party(metaclass=PoolMeta):
     __name__ = 'party.party'
 
+    xrechnung_routeid = fields.Boolean(
+        string='X-Rechnung Route-ID',
+        help='Enables the need for an XRechnung route ID at the party ' +
+        'for exporting the XRechnung.')
+
     def get_xrechnung_route_id(self):
         """ search for route-id at party, fire-exception if missing
         """
         for ident in self.identifiers:
             if ident.type == 'edoc_route_id':
                 return ident.code
-        raise UserError(gettext(
-            'edocument_xrechnung.msg_missing_xrechnung_route_id',
-            partyname=self.rec_name))
+
+        if self.xrechnung_routeid:
+            raise UserError(gettext(
+                'edocument_xrechnung.msg_missing_xrechnung_route_id',
+                partyname=self.rec_name))
+
+    @classmethod
+    def default_xrechnung_routeid(cls):
+        """ default for needs-route-id
+
+        Returns:
+            bool: default False
+        """
+        return False
+
+    @classmethod
+    def validate(cls, records):
+        """ validate setup of xrechnung route id
+
+        Args:
+            records (list): records of party.party
+        """
+        super(Party, cls).validate(records)
+        for record in records:
+            record.get_xrechnung_route_id()
 
 # end Party
 
diff --git a/party.xml b/party.xml
new file mode 100644
index 0000000..da53876
--- /dev/null
+++ b/party.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<!-- # This file is part of the edocument-module for Tryton from m-ds.de.
+ The COPYRIGHT file at the top level of this repository contains the
+ full copyright notices and license terms. -->
+<tryton>
+    <data>
+
+        <record model="ir.ui.view" id="party_view_form">
+            <field name="model">party.party</field>
+            <field name="inherit" ref="party.party_view_form"/>
+            <field name="name">party_form</field>
+        </record>
+
+    </data>
+</tryton>
diff --git a/setup.py b/setup.py
index 931c09d..aceddc5 100644
--- a/setup.py
+++ b/setup.py
@@ -98,7 +98,8 @@ setup(
         'trytond.modules.%s' % MODULE: (
             info.get('xml', [])
             + ['tryton.cfg', 'locale/*.po', 'tests/*.py',
-                'template/*/*.xml', 'versiondep.txt', 'README.rst']),
+                'template/*/*.xml', 'versiondep.txt', 'README.rst',
+                'tests/*/*/*/*.xsd']),
         },
 
     install_requires=requires,
diff --git a/template/XRechnung-2.2/XRechnung_credit.xml b/template/XRechnung-2.2/XRechnung_credit.xml
index e12ba91..f0bf795 100644
--- a/template/XRechnung-2.2/XRechnung_credit.xml
+++ b/template/XRechnung-2.2/XRechnung_credit.xml
@@ -93,7 +93,7 @@
   <cbc:CreditNoteTypeCode>${this.type_code}</cbc:CreditNoteTypeCode>
   <cbc:Note py:if="this.invoice_note()">${this.invoice_note()}</cbc:Note>
   <cbc:DocumentCurrencyCode>${this.invoice.currency.code}</cbc:DocumentCurrencyCode>
-  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id()}</cbc:BuyerReference>
+  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id() or ''}</cbc:BuyerReference>
   <cac:OrderReference py:if="this.invoice.reference">
     <cbc:ID>${this.invoice.reference}</cbc:ID>
     <cbc:SalesOrderID py:if="this.sales_order_nums()">${this.sales_order_nums()}</cbc:SalesOrderID>
diff --git a/template/XRechnung-2.2/XRechnung_invoice.xml b/template/XRechnung-2.2/XRechnung_invoice.xml
index 396cf24..cf4ee6d 100644
--- a/template/XRechnung-2.2/XRechnung_invoice.xml
+++ b/template/XRechnung-2.2/XRechnung_invoice.xml
@@ -94,7 +94,7 @@
   <cbc:InvoiceTypeCode>${this.type_code}</cbc:InvoiceTypeCode>
   <cbc:Note py:if="this.invoice_note()">${this.invoice_note()}</cbc:Note>
   <cbc:DocumentCurrencyCode>${this.invoice.currency.code}</cbc:DocumentCurrencyCode>
-  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id()}</cbc:BuyerReference>
+  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id() or ''}</cbc:BuyerReference>
   <cac:OrderReference py:if="this.invoice.reference">
     <cbc:ID>${this.invoice.reference}</cbc:ID>
     <cbc:SalesOrderID py:if="this.sales_order_nums()">${this.sales_order_nums()}</cbc:SalesOrderID>
diff --git a/template/XRechnung-2.3/XRechnung_credit.xml b/template/XRechnung-2.3/XRechnung_credit.xml
index b487804..4ad9ccc 100644
--- a/template/XRechnung-2.3/XRechnung_credit.xml
+++ b/template/XRechnung-2.3/XRechnung_credit.xml
@@ -93,7 +93,7 @@
   <cbc:CreditNoteTypeCode>${this.type_code}</cbc:CreditNoteTypeCode>
   <cbc:Note py:if="this.invoice_note()">${this.invoice_note()}</cbc:Note>
   <cbc:DocumentCurrencyCode>${this.invoice.currency.code}</cbc:DocumentCurrencyCode>
-  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id()}</cbc:BuyerReference>
+  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id() or ''}</cbc:BuyerReference>
   <cac:OrderReference py:if="this.invoice.reference">
     <cbc:ID>${this.invoice.reference}</cbc:ID>
     <cbc:SalesOrderID py:if="this.sales_order_nums()">${this.sales_order_nums()}</cbc:SalesOrderID>
diff --git a/template/XRechnung-2.3/XRechnung_invoice.xml b/template/XRechnung-2.3/XRechnung_invoice.xml
index f3599a1..517b6e4 100644
--- a/template/XRechnung-2.3/XRechnung_invoice.xml
+++ b/template/XRechnung-2.3/XRechnung_invoice.xml
@@ -94,7 +94,7 @@
   <cbc:InvoiceTypeCode>${this.type_code}</cbc:InvoiceTypeCode>
   <cbc:Note py:if="this.invoice_note()">${this.invoice_note()}</cbc:Note>
   <cbc:DocumentCurrencyCode>${this.invoice.currency.code}</cbc:DocumentCurrencyCode>
-  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id()}</cbc:BuyerReference>
+  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id() or ''}</cbc:BuyerReference>
   <cac:OrderReference py:if="this.invoice.reference">
     <cbc:ID>${this.invoice.reference}</cbc:ID>
     <cbc:SalesOrderID py:if="this.sales_order_nums()">${this.sales_order_nums()}</cbc:SalesOrderID>
diff --git a/template/XRechnung-3.0/XRechnung_credit.xml b/template/XRechnung-3.0/XRechnung_credit.xml
index 6c3db35..102d85b 100644
--- a/template/XRechnung-3.0/XRechnung_credit.xml
+++ b/template/XRechnung-3.0/XRechnung_credit.xml
@@ -93,7 +93,7 @@
   <cbc:CreditNoteTypeCode>${this.type_code}</cbc:CreditNoteTypeCode>
   <cbc:Note py:if="this.invoice_note()">${this.invoice_note()}</cbc:Note>
   <cbc:DocumentCurrencyCode>${this.invoice.currency.code}</cbc:DocumentCurrencyCode>
-  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id()}</cbc:BuyerReference>
+  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id() or ''}</cbc:BuyerReference>
   <cac:OrderReference py:if="this.invoice.reference">
     <cbc:ID>${this.invoice.reference}</cbc:ID>
     <cbc:SalesOrderID py:if="this.sales_order_nums()">${this.sales_order_nums()}</cbc:SalesOrderID>
diff --git a/template/XRechnung-3.0/XRechnung_invoice.xml b/template/XRechnung-3.0/XRechnung_invoice.xml
index c25d170..9108504 100644
--- a/template/XRechnung-3.0/XRechnung_invoice.xml
+++ b/template/XRechnung-3.0/XRechnung_invoice.xml
@@ -94,7 +94,7 @@
   <cbc:InvoiceTypeCode>${this.type_code}</cbc:InvoiceTypeCode>
   <cbc:Note py:if="this.invoice_note()">${this.invoice_note()}</cbc:Note>
   <cbc:DocumentCurrencyCode>${this.invoice.currency.code}</cbc:DocumentCurrencyCode>
-  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id()}</cbc:BuyerReference>
+  <cbc:BuyerReference>${this.invoice.party.get_xrechnung_route_id() or ''}</cbc:BuyerReference>
   <cac:OrderReference py:if="this.invoice.reference">
     <cbc:ID>${this.invoice.reference}</cbc:ID>
     <cbc:SalesOrderID py:if="this.sales_order_nums()">${this.sales_order_nums()}</cbc:SalesOrderID>
diff --git a/tests/test_edocument.py b/tests/test_edocument.py
index 936a00d..e86e3c0 100644
--- a/tests/test_edocument.py
+++ b/tests/test_edocument.py
@@ -11,6 +11,7 @@ from datetime import date
 from trytond.tests.test_tryton import ModuleTestCase, with_transaction
 from trytond.pool import Pool
 from trytond.modules.edocument_uncefact.tests.test_edocument_uncefact import get_invoice
+from trytond.exceptions import UserError
 from unittest.mock import Mock
 from decimal import Decimal
 
@@ -19,6 +20,34 @@ class EdocTestCase(ModuleTestCase):
     'Test e-rechnung module'
     module = 'edocument_xrechnung'
 
+    @with_transaction()
+    def test_xrechn_check_validator(self):
+        """ check validation of optional route-id
+        """
+        Party = Pool().get('party.party')
+
+        party, = Party.create([{'name': 'P1'}])
+        self.assertEqual(party.xrechnung_routeid, False)
+
+        Party.write(*[
+            [party],
+            {
+                'xrechnung_routeid': True,
+                'identifiers': [('create', [{
+                    'type': 'edoc_route_id',
+                    'code': '1234'}])]}])
+        self.assertEqual(party.xrechnung_routeid, True)
+        self.assertEqual(party.get_xrechnung_route_id(), '1234')
+
+        self.assertRaisesRegex(
+            UserError,
+            "No XRechnung routing ID is stored for the party 'P1'.",
+            Party.write,
+            *[
+                [party],
+                {'identifiers': [('delete', [party.identifiers[0].id])]}]
+            )
+
     @with_transaction()
     def test_xrechn_export_xml_invoice(self):
         """ run export - invoice
diff --git a/tryton.cfg b/tryton.cfg
index 95aecba..aed6464 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -7,3 +7,4 @@ depends:
     account_invoice
 xml:
     message.xml
+    party.xml
diff --git a/view/party_form.xml b/view/party_form.xml
new file mode 100644
index 0000000..0bc31b7
--- /dev/null
+++ b/view/party_form.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<!-- # This file is part of the edocument-module for Tryton from m-ds.de.
+ The COPYRIGHT file at the top level of this repository contains the
+ full copyright notices and license terms. -->
+<data>
+
+    <xpath expr="/form/notebook/page[@id='accounting']/separator[@id='account']"
+        position="before">
+
+        <separator string="X-Rechnung" colspan="4" id="xrechnung_routeid"/>
+        <label name="xrechnung_routeid"/>
+        <field name="xrechnung_routeid"/>
+        <newline/>
+
+    </xpath>
+</data>