diff --git a/.hgignore b/.hgignore
index 913ee1b..1b85cd9 100644
--- a/.hgignore
+++ b/.hgignore
@@ -1,6 +1,3 @@
 syntax: glob
 __pycache__/*
 locale/convert_de2en.py
-build/*
-mds_cashbook_media.egg-info/*
-dist/*
diff --git a/README.rst b/README.rst
index c16afe5..f2bfb6f 100644
--- a/README.rst
+++ b/README.rst
@@ -9,11 +9,12 @@ pip install mds-cashbook-media
 
 Requires
 ========
-- Tryton 7.0
+- Tryton 6.0
 
 Changes
 =======
 
-*7.0.0 - 01.12.2023*
+*6.0.0 - 14.10.2022*
+
+- init
 
-- ported to Tryton 7.0
diff --git a/__init__.py b/__init__.py
index 4c95efa..8681953 100644
--- a/__init__.py
+++ b/__init__.py
@@ -6,7 +6,6 @@
 from trytond.pool import Pool
 from .line import Line
 
-
 def register():
     Pool.register(
         Line,
diff --git a/line.py b/line.py
index a0ecf3e..a7a482d 100644
--- a/line.py
+++ b/line.py
@@ -3,13 +3,13 @@
 # The COPYRIGHT file at the top level of this repository contains the
 # full copyright notices and license terms.
 
-import mimetypes
-import magic
+import mimetypes, magic
 from io import BytesIO
-from PIL import Image, UnidentifiedImageError
+from PIL import Image
 from trytond.model import fields
-from trytond.pool import PoolMeta
+from trytond.pool import Pool, PoolMeta
 from trytond.config import config
+from trytond.transaction import Transaction
 from trytond.exceptions import UserError
 from trytond.i18n import gettext
 from trytond.pyson import Eval, Bool
@@ -18,50 +18,30 @@ from trytond.modules.cashbook.line import STATES, DEPENDS
 
 store_prefix = config.get('cashbook', 'store_prefix', default='cashbook')
 image_limit = config.get('cashbook', 'image_max_pixel', default='2000')
-try:
+try :
     image_limit = int(image_limit)
     if image_limit < 100:
         image_limit = 100
     if image_limit > 10000:
         image_limit = 10000
-except Exception:
+except :
     image_limit = 2000
 
 
-STATES2 = {}
-STATES2.update(STATES)
-DEPENDS2 = []
-DEPENDS2.extend(DEPENDS)
-
-
 class Line(metaclass=PoolMeta):
     __name__ = 'cashbook.line'
 
-    media = fields.Binary(
-        string='Image of PDF', filename='media_name', file_id='media_id',
-        store_prefix=store_prefix, states=STATES2, depends=DEPENDS2)
-    media_name = fields.Char(
-        string='File name',
+    media = fields.Binary(string='Image of PDF', filename='media_name',
+        file_id='media_id', store_prefix=store_prefix,
+        states=STATES, depends=DEPENDS)
+    media_name = fields.Char(string='File name',
         states={
             'required': Bool(Eval('media')),
-            'readonly': STATES2['readonly'],
-        }, depends=DEPENDS2)
+            'readonly': STATES['readonly'],
+        }, depends=DEPENDS)
     media_id = fields.Char(string='File ID', readonly=True)
     media_mime = fields.Char(string='MIME', readonly=True)
     media_size = fields.Integer(string='File size', readonly=True)
-    media_image = fields.Function(fields.Binary(
-        string='Image', readonly=True,
-        states={
-            'invisible': ~Eval('media_mime', '').in_([
-                'image/png', 'image/jpg', 'image/jpeg']),
-        }, depends=['media_mime']), 'on_change_with_media_image')
-
-    @fields.depends('media', 'media_mime')
-    def on_change_with_media_image(self, name=True):
-        """ return binary if its a image
-        """
-        if (self.media_mime or '-').startswith('image/'):
-            return self.media
 
     @classmethod
     def _identify_file(cls, data, mime=True):
@@ -85,17 +65,14 @@ class Line(metaclass=PoolMeta):
         """
         image_data2 = None
         with BytesIO(image_data) as fhdl:
-            try:
-                image = Image.open(fhdl, 'r')
-            except UnidentifiedImageError:
-                raise UserError(gettext('cashbook_media.msg_file_unknown_type'))
+            image = Image.open(fhdl, 'r')
 
             (width, height) = image.size
             if (width > image_limit) or (height > image_limit):
 
                 if width > height:
                     new_size = (image_limit, int(height * image_limit / width))
-                else:
+                else :
                     new_size = (int(width * image_limit / height), image_limit)
 
                 # resize - fit in (image_limit x image_limit)
@@ -118,17 +95,15 @@ class Line(metaclass=PoolMeta):
             values['media_mime'] = None
             values['media_size'] = None
             values['media_name'] = None
-        else:
+        else :
             values['media_mime'] = cls._identify_file(values['media'][:1024])
 
-            # if its a image, resize it to fit
-            # in (image_limit x image_limit) pixel
+            # if its a image, resize it to fit in (image_limit x image_limit) pixel
             if values['media_mime'].startswith('image'):
                 new_image = cls.resize_image_file(values['media'])
                 if new_image is not None:
                     values['media'] = new_image
-                    values['media_mime'] = cls._identify_file(
-                        values['media'][:1024])
+                    values['media_mime'] = cls._identify_file(values['media'][:1024])
 
             values['media_size'] = len(values['media'])
             file_ext = mimetypes.guess_extension(values['media_mime'])
@@ -151,14 +126,15 @@ class Line(metaclass=PoolMeta):
                 if line.media_size > 1024*1024*5:
                     raise UserError(gettext(
                         'cashbook_media.msg_file_too_big',
-                        recname=line.rec_name))
-                if line.media_mime not in [
-                        'application/pdf',
-                        'image/png', 'image/jpg', 'image/jpeg']:
+                        recname = line.rec_name,
+                        ))
+                if not line.media_mime in ['application/pdf',
+                    'image/png', 'image/jpg', 'image/jpeg']:
                     raise UserError(gettext(
                         'cashbook_media.msg_file_invalid_mime',
-                        recname=line.rec_name,
-                        fmime=line.media_mime))
+                        recname = line.rec_name,
+                        fmime = line.media_mime,
+                        ))
 
     @classmethod
     def create(cls, vlist):
diff --git a/locale/de.po b/locale/de.po
index 7618e5c..69df498 100644
--- a/locale/de.po
+++ b/locale/de.po
@@ -14,10 +14,6 @@ msgctxt "model:ir.message,text:msg_file_invalid_mime"
 msgid "The file type '%(fmime)s' of the record '%(recname)s' is not allowed. (allowed: PNG, JPG, PDF)"
 msgstr "Der Dateityp '%(fmime)s' des Datensatzes '%(recname)s' ist nicht zugelassen. (erlaubt: PNG, JPG, PDF)"
 
-msgctxt "model:ir.message,text:msg_file_unknown_type"
-msgid "cannot identify image file"
-msgstr "Bilddatei kann nicht identifiziert werden"
-
 
 #################
 # cashbook.line #
@@ -46,6 +42,3 @@ msgctxt "field:cashbook.line,media_size:"
 msgid "File size"
 msgstr "Dateigröße"
 
-msgctxt "field:cashbook.line,media_image:"
-msgid "Image"
-msgstr "Bild"
diff --git a/locale/en.po b/locale/en.po
index 5ff9df6..956e614 100644
--- a/locale/en.po
+++ b/locale/en.po
@@ -10,10 +10,6 @@ msgctxt "model:ir.message,text:msg_file_invalid_mime"
 msgid "The file type '%(fmime)s' of the record '%(recname)s' is not allowed. (allowed: PNG, JPG, PDF)"
 msgstr "The file type '%(fmime)s' of the record '%(recname)s' is not allowed. (allowed: PNG, JPG, PDF)"
 
-msgctxt "model:ir.message,text:msg_file_unknown_type"
-msgid "cannot identify image file"
-msgstr "cannot identify image file"
-
 msgctxt "view:cashbook.line:"
 msgid "Image/PDF"
 msgstr "Image/PDF"
diff --git a/message.xml b/message.xml
index 3582d1e..d88ff9a 100644
--- a/message.xml
+++ b/message.xml
@@ -11,9 +11,6 @@ full copyright notices and license terms. -->
         <record model="ir.message" id="msg_file_invalid_mime">
             <field name="text">The file type '%(fmime)s' of the record '%(recname)s' is not allowed. (allowed: PNG, JPG, PDF)</field>
         </record>
-        <record model="ir.message" id="msg_file_unknown_type">
-            <field name="text">cannot identify image file</field>
-        </record>
 
     </data>
 </tryton>
diff --git a/setup.py b/setup.py
index c3531db..aa97035 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 """
 
 # Always prefer setuptools over distutils
-from setuptools import setup
+from setuptools import setup, find_packages
 # To use a consistent encoding
 from codecs import open
 from os import path
@@ -36,10 +36,10 @@ with open(path.join(here, 'versiondep.txt'), encoding='utf-8') as f:
         l2 = i.strip().split(';')
         if len(l2) < 4:
             continue
-        modversion[l2[0]] = {'min': l2[1], 'max': l2[2], 'prefix': l2[3]}
+        modversion[l2[0]] = {'min':l2[1], 'max':l2[2], 'prefix':l2[3]}
 
 # tryton-version
-major_version = 7
+major_version = 6
 minor_version = 0
 
 requires = ['python-magic>=0.4.24', 'Pillow']
@@ -51,52 +51,42 @@ for dep in info.get('depends', []):
                 prefix = modversion[dep]['prefix']
 
             if len(modversion[dep]['max']) > 0:
-                requires.append(
-                    '%s_%s >= %s, <= %s' %
-                    (prefix, dep,
-                        modversion[dep]['min'],
-                        modversion[dep]['max']))
-            else:
-                requires.append(
-                    '%s_%s >= %s' %
+                requires.append('%s_%s >= %s, <= %s' %
+                    (prefix, dep, modversion[dep]['min'], modversion[dep]['max']))
+            else :
+                requires.append('%s_%s >= %s' %
                     (prefix, dep, modversion[dep]['min']))
-        else:
-            requires.append(
-                '%s_%s >= %s.%s, < %s.%s' % (
-                    'trytond', dep, major_version, minor_version,
-                    major_version, minor_version + 1))
-requires.append(
-    'trytond >= %s.%s, < %s.%s' % (
-        major_version, minor_version, major_version, minor_version + 1))
+        else :
+          requires.append('%s_%s >= %s.%s, < %s.%s' %
+                ('trytond', dep, major_version, minor_version,
+                major_version, minor_version + 1))
+requires.append('trytond >= %s.%s, < %s.%s' %
+        (major_version, minor_version, major_version, minor_version + 1))
 
-setup(
-    name='%s_%s' % (PREFIX, MODULE),
+setup(name='%s_%s' % (PREFIX, MODULE),
     version=info.get('version', '0.0.1'),
     description='Tryton module to add a file-field to cashbook.',
     long_description=long_description,
-    long_description_content_type='text/x-rst',
     url='https://www.m-ds.de/',
-    download_url='https://scmdev.m-ds.de/Tryton/Extra/cashbook_media',
     author='martin-data services',
     author_email='service@m-ds.de',
     license='GPL-3',
     classifiers=[
-        'Development Status :: 5 - Production/Stable',
-        'Environment :: Plugins',
-        'Framework :: Tryton',
-        'Intended Audience :: Developers',
-        'Intended Audience :: Customer Service',
-        'Intended Audience :: Information Technology',
-        'Intended Audience :: Financial and Insurance Industry',
-        'Topic :: Office/Business',
-        'Topic :: Office/Business :: Financial :: Accounting',
-        'Natural Language :: German',
-        'Natural Language :: English',
-        'Operating System :: OS Independent',
-        'License :: OSI Approved :: GNU General Public License (GPL)',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: 3.9',
+    'Development Status :: 5 - Production/Stable',
+    'Environment :: Plugins',
+    'Framework :: Tryton',
+    'Intended Audience :: Developers',
+    'Intended Audience :: Customer Service',
+    'Intended Audience :: Information Technology',
+    'Intended Audience :: Financial and Insurance Industry',
+    'Topic :: Office/Business',
+    'Topic :: Office/Business :: Financial :: Accounting',
+    'Natural Language :: German',
+    'Natural Language :: English',
+    'Operating System :: OS Independent',
+    'License :: OSI Approved :: GNU General Public License (GPL)',
+    'Programming Language :: Python :: 3.7',
+    'Programming Language :: Python :: 3.8',
     ],
 
     keywords='tryton cashbook pdf png image file',
@@ -105,8 +95,7 @@ setup(
         'trytond.modules.%s' % MODULE,
         ],
     package_data={
-        'trytond.modules.%s' % MODULE: (
-            info.get('xml', [])
+        'trytond.modules.%s' % MODULE: (info.get('xml', [])
             + ['tryton.cfg', 'locale/*.po', 'tests/*.py',
                 'view/*.xml', 'versiondep.txt', 'README.rst']),
         },
diff --git a/tests/__init__.py b/tests/__init__.py
index 4effdfa..fa351bf 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,2 +1,24 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
+
+import trytond.tests.test_tryton
+import unittest
+
+from trytond.modules.cashbook_media.tests.test_line import LineTestCase
+
+
+__all__ = ['suite']
+
+
+class CashbookTestCase(\
+    LineTestCase,
+    ):
+    'Test cashbook module'
+    module = 'cashbook_media'
+
+# end CashbookTestCase
+
+def suite():
+    suite = trytond.tests.test_tryton.suite()
+    suite.addTests(unittest.TestLoader().loadTestsFromTestCase(CashbookTestCase))
+    return suite
diff --git a/tests/test_line.py b/tests/test_line.py
index a6fbe1d..28fadd9 100644
--- a/tests/test_line.py
+++ b/tests/test_line.py
@@ -5,10 +5,11 @@
 
 from io import BytesIO
 from PIL import Image
-from trytond.tests.test_tryton import with_transaction
+from trytond.tests.test_tryton import ModuleTestCase, with_transaction
 from trytond.pool import Pool
+from trytond.transaction import Transaction
 from trytond.exceptions import UserError
-from trytond.modules.cashbook.tests.test_module import CashbookTestCase
+from trytond.modules.cashbook.tests import CashbookTestCase
 from datetime import date
 from decimal import Decimal
 from .img_data import img_data_png, dok_data_pdf, text_data
@@ -125,11 +126,8 @@ class LineTestCase(CashbookTestCase):
         self.assertEqual(book.state, 'open')
 
         # add invalid file
-        self.assertRaisesRegex(
-            UserError,
-            "The file type 'text/plain' of the record " +
-            "'05/02/2022|Rev|1.00 usd|Text 2 [Cat1]' is not allowed. " +
-            "(allowed: PNG, JPG, PDF)",
+        self.assertRaisesRegex(UserError,
+            "The file type 'text/plain' of the record '05/02/2022|Rev|1.00 usd|Text 2 [Cat1]' is not allowed. (allowed: PNG, JPG, PDF)",
             Book.write,
             *[
                 [book],
@@ -148,11 +146,8 @@ class LineTestCase(CashbookTestCase):
             ])
 
         # replace image at line-1 by invalid file
-        self.assertRaisesRegex(
-            UserError,
-            "The file type 'text/plain' of the record " +
-            "'05/02/2022|Rev|1.00 usd|Text 2 [Cat1]' is not allowed. " +
-            "(allowed: PNG, JPG, PDF)",
+        self.assertRaisesRegex(UserError,
+            "The file type 'text/plain' of the record '05/02/2022|Rev|1.00 usd|Text 2 [Cat1]' is not allowed. (allowed: PNG, JPG, PDF)",
             Lines.write,
             *[
                 [book.lines[0]],
@@ -168,6 +163,7 @@ class LineTestCase(CashbookTestCase):
         """
         pool = Pool()
         Book = pool.get('cashbook.book')
+        Lines = pool.get('cashbook.line')
 
         types = self.prep_type()
         category = self.prep_category(cattype='in')
@@ -230,6 +226,3 @@ class LineTestCase(CashbookTestCase):
             self.assertEqual(img2.size, (2000, 837))
 
 # end LineTestCase
-
-
-del CashbookTestCase
diff --git a/tryton.cfg b/tryton.cfg
index e0bd666..f9732b4 100644
--- a/tryton.cfg
+++ b/tryton.cfg
@@ -1,7 +1,8 @@
 [tryton]
-version=7.0.0
+version=6.0.0
 depends:
     cashbook
 xml:
     message.xml
     line.xml
+
diff --git a/versiondep.txt b/versiondep.txt
index bae9199..7a98af6 100644
--- a/versiondep.txt
+++ b/versiondep.txt
@@ -1 +1 @@
-cashbook;7.0.31;7.0.999;mds
+cashbook;6.0.18;6.0.999;mds
diff --git a/view/line_form.xml b/view/line_form.xml
index 0d80ebc..6785333 100644
--- a/view/line_form.xml
+++ b/view/line_form.xml
@@ -13,10 +13,10 @@ full copyright notices and license terms. -->
 
             <label name="media_name"/>
             <field name="media_name"/>
+
             <label name="media_mime"/>
             <field name="media_mime"/>
 
-            <field name="media_image" readonly="1" colspan="4" widget="image" xexpand="1" yexpand="1"/>
         </page>
 
     </xpath>