diff --git a/locale/en.po b/locale/en.po
index 3e16682..5d9a36b 100644
--- a/locale/en.po
+++ b/locale/en.po
@@ -22,6 +22,10 @@ msgctxt "field:account_invoice_xrechnung.runrep.start,edocument:"
 msgid "Type"
 msgstr "Type"
 
+msgctxt "field:account_invoice_xrechnung.runrep.start,as_zip:"
+msgid "ZIP-File"
+msgstr "ZIP-File"
+
 msgctxt "model:account_invoice_xrechnung.runrep,name:"
 msgid "eDocument Export"
 msgstr "eDocument Export"
diff --git a/message.xml b/message.xml
new file mode 100644
index 0000000..6df4deb
--- /dev/null
+++ b/message.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!-- This file is part of the cashbook-module from m-ds for Tryton.
+The COPYRIGHT file at the top level of this repository contains the
+full copyright notices and license terms. -->
+<tryton>
+    <data>
+
+        <record model="ir.message" id="msg_invoice_must_posted">
+            <field name="text">Invoice '%(invname)s' must be posted.</field>
+        </record>
+
+    </data>
+</tryton>
diff --git a/tryton.cfg b/tryton.cfg
index ffc3e07..27e058c 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -5,5 +5,6 @@ depends:
     bank
     edocument_xrechnung
 xml:
+    message.xml
     wizard_runreport.xml
     xreport.xml
diff --git a/view/wizard_form.xml b/view/wizard_form.xml
index 10295d1..9ed0b0c 100644
--- a/view/wizard_form.xml
+++ b/view/wizard_form.xml
@@ -10,5 +10,6 @@ full copyright notices and license terms. -->
 
     <label name="as_zip"/>
     <field name="as_zip"/>
+    <field name="state"/>
 
 </form>
diff --git a/wizard_runreport.py b/wizard_runreport.py
index dc86ac7..a821963 100644
--- a/wizard_runreport.py
+++ b/wizard_runreport.py
@@ -6,6 +6,8 @@
 from trytond.model import ModelView, fields
 from trytond.wizard import Wizard, StateView, StateReport, Button
 from trytond.pool import Pool
+from trytond.exceptions import UserError
+from trytond.i18n import gettext
 from trytond.transaction import Transaction
 
 
@@ -20,13 +22,14 @@ edoc_versions = {
     }
 
 
-
 class RunXRechnungReportStart(ModelView):
     'eDocument Export'
     __name__ = 'account_invoice_xrechnung.runrep.start'
 
     invoice = fields.Many2One(string='Invoice', readonly=True,
         model_name='account.invoice', required=True)
+    state = fields.Char(string='State', readonly=True,
+        states={'invisible': True})
     edocument = fields.Selection(string='Type', required=True,
         selection=sel_edocument)
     as_zip = fields.Boolean(string='ZIP-File')
@@ -65,16 +68,24 @@ class RunXRechnungReport(Wizard):
         """ set defaults
         """
         context = Transaction().context
+        Invoice = Pool().get('account.invoice')
 
+        invoice = Invoice.browse([context.get('active_id', -1)])
         result = {
             'edocument': 'edocument.xrechnung.invoice',
             'invoice': context.get('active_id', -1),
+            'state': invoice[0].state if len(invoice) > 0 else '',
             }
         return result
 
     def do_export(self, action):
         """ run export
         """
+        if self.start.state != 'posted':
+            raise UserError(gettext(
+                'account_invoice_xrechnung.msg_invoice_must_posted',
+                invname = self.start.invoice.rec_name,
+                ))
         return action, {
             'invoice': self.start.invoice.id,
             'edocument': self.start.edocument,