diff --git a/locale/de.po b/locale/de.po
index 3aace03..fa4d8f9 100644
--- a/locale/de.po
+++ b/locale/de.po
@@ -54,6 +54,10 @@ msgctxt "model:ir.message,text:msg_wiz_transactions_error"
 msgid "When reading the QIF file, there were the following problems:"
 msgstr "Beim Einlesen der QIF-Datei gab es folgende Probleme:"
 
+msgctxt "model:ir.message,text:mds_import_no_category"
+msgid "No category has been assigned for transaction '%(trdata)s'."
+msgstr "Für die Transaktion '%(trdata)s' wurde keine Kategorie zugeordnet."
+
 
 #############
 # ir.action #
diff --git a/message.xml b/message.xml
index b777317..18111aa 100644
--- a/message.xml
+++ b/message.xml
@@ -41,6 +41,9 @@ full copyright notices and license terms. -->
         <record model="ir.message" id="mds_import_address">
             <field name="text">Address</field>
         </record>
+        <record model="ir.message" id="mds_import_no_category">
+            <field name="text">No category has been assigned for transaction '%(trdata)s'.</field>
+        </record>
 
     </data>
 </tryton>
diff --git a/qiftool.py b/qiftool.py
index 1f9e48c..4ab937d 100644
--- a/qiftool.py
+++ b/qiftool.py
@@ -400,6 +400,14 @@ class QifTool(Model):
                 if 'splitlines' in line.keys():
                     line['state'] = 'edit'
 
+            # check data
+            if line['bookingtype'] in ['in', 'out']:
+                if line.get('category', None) is None:
+                    msg_list.append(gettext(
+                        'cashbook_dataexchange.mds_import_no_category',
+                        trdata = str(transaction)))
+                    fail_cnt += 1
+
             to_create.append(line)
         return (to_create, msg_list, fail_cnt)