diff --git a/line.py b/line.py
index 099bde5..d45ce5b 100644
--- a/line.py
+++ b/line.py
@@ -984,12 +984,6 @@ class LineContext(ModelView):
     'Line Context'
     __name__ = 'cashbook.line.context'
 
-    cashbook = fields.Many2One(string='Cashbook', required=True,
-        model_name='cashbook.book',
-        domain=[('btype', '!=', None)],
-        states={
-            'readonly': Eval('num_cashbook', 0) < 2,
-        }, depends=['num_cashbook'])
     date_from = fields.Date(string='Start Date', depends=['date_to'],
         help='Limits the date range for the displayed entries.',
         domain=[
@@ -1008,16 +1002,6 @@ class LineContext(ModelView):
         help='Show account lines in Checked-state.')
     done = fields.Boolean(string='Done',
         help='Show account lines in Done-state.')
-    num_cashbook = fields.Function(fields.Integer(string='Number of Cashbook',
-        readonly=True, states={'invisible': True}),
-        'on_change_with_num_cashbook')
-
-    @classmethod
-    def default_cashbook(cls):
-        """ get default from context
-        """
-        context = Transaction().context
-        return context.get('cashbook', None)
 
     @classmethod
     def default_date_from(cls):
@@ -1040,17 +1024,6 @@ class LineContext(ModelView):
         context = Transaction().context
         return context.get('checked', False)
 
-    @classmethod
-    def default_num_cashbook(cls):
-        """ get default from context
-        """
-        CashBook = Pool().get('cashbook.book')
-
-        with Transaction().set_context({
-            '_check_access': True,
-            }):
-            return CashBook.search_count([('btype', '!=', None)])
-
     @classmethod
     def default_done(cls):
         """ get default from context
@@ -1058,11 +1031,4 @@ class LineContext(ModelView):
         context = Transaction().context
         return context.get('done', False)
 
-    def on_change_with_num_cashbook(self, name=None):
-        """ get number of accessible cashbooks,
-            depends on user-permissions
-        """
-        LineContext = Pool().get('cashbook.line.context')
-        return LineContext.default_num_cashbook()
-
 # end LineContext
diff --git a/line.xml b/line.xml
index 284f259..b2a7ea3 100644
--- a/line.xml
+++ b/line.xml
@@ -32,7 +32,6 @@ full copyright notices and license terms. -->
             <field name="context_model">cashbook.line.context</field>
             <field name="context_domain"
                 eval="[
-                    ('cashbook', '=', Eval('cashbook', -1)),
                     If(Bool(Eval('date_from')), ('date', '&gt;=', Eval('date_from')), ()),
                     If(Bool(Eval('date_to')), ('date', '&lt;=', Eval('date_to')), ()),
                     ['OR',
@@ -42,6 +41,9 @@ full copyright notices and license terms. -->
                     ],
                     ]"
                 pyson="1"/>
+            <field name="domain"
+                eval="[('cashbook', '=', Eval('cashbook', -1))]"
+                pyson="1"/>
         </record>
         <record model="ir.action.act_window.view" id="act_line_view-1">
             <field name="sequence" eval="10"/>
diff --git a/view/cashbook_line_context_form.xml b/view/cashbook_line_context_form.xml
index 01f1edb..9f7cbe1 100644
--- a/view/cashbook_line_context_form.xml
+++ b/view/cashbook_line_context_form.xml
@@ -2,20 +2,14 @@
 <!-- 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. -->
-<form col="6">
-    <label name="cashbook"/>
-    <field name="cashbook" widget="selection" colspan="3"/>
-
-    <label name="checked"/>
-    <field name="checked"/>
-
+<form col="8">
     <label name="date_from"/>
     <field name="date_from"/>
     <label name="date_to"/>
     <field name="date_to"/>
+    <label name="checked"/>
+    <field name="checked"/>
     <label name="done"/>
     <field name="done"/>
-
-    <field name="num_cashbook"/>
 </form>
 
diff --git a/wizard_openline.py b/wizard_openline.py
index 4aac5be..f4a6dbd 100644
--- a/wizard_openline.py
+++ b/wizard_openline.py
@@ -12,6 +12,32 @@ from trytond.exceptions import UserError
 from trytond.transaction import Transaction
 
 
+class OLineMixin:
+    """ mixin to extend action-data
+    """
+    def add_action_data(self, book):
+        """ add book and cfg
+        """
+        Configuration = Pool().get('cashbook.configuration')
+        cfg1 = Configuration.get_singleton()
+        action = {
+            'pyson_context': PYSONEncoder().encode({
+                'cashbook': getattr(book, 'id', None),
+                'date_from': getattr(cfg1, 'date_from', None),
+                'date_to': getattr(cfg1, 'date_to', None),
+                'checked': getattr(cfg1, 'checked', None),
+                'done': getattr(cfg1, 'done', None),
+                }),
+            'name' : '%(name)s: %(cashbook)s' % {
+                'name': gettext('cashbook.msg_name_cashbook'),
+                'cashbook': getattr(book, 'rec_name', '-/-'),
+                },
+            }
+        return action
+
+# OLineMixin
+
+
 class OpenCashBookStart(ModelView):
     'Open Cashbook'
     __name__ = 'cashbook.open_lines.start'
@@ -34,7 +60,7 @@ class OpenCashBookStart(ModelView):
 # end OpenCashBookStart
 
 
-class OpenCashBook(Wizard):
+class OpenCashBook(OLineMixin, Wizard):
     'Open Cashbook'
     __name__ = 'cashbook.open_lines'
 
@@ -95,29 +121,13 @@ class OpenCashBook(Wizard):
                 if len(books) > 0:
                     book = books[0]
 
-        date_from = getattr(self.askuser, 'date_from', None)
-        date_to = getattr(self.askuser, 'date_to', None)
-        checked = getattr(self.askuser, 'checked', True)
-        done = getattr(self.askuser, 'done', False)
-
         # save settings
-        cfg1.date_from = date_from
-        cfg1.date_to = date_to
-        cfg1.checked = checked
-        cfg1.done = done
+        cfg1.date_from = getattr(self.askuser, 'date_from', None)
+        cfg1.date_to = getattr(self.askuser, 'date_to', None)
+        cfg1.checked = getattr(self.askuser, 'checked', True)
+        cfg1.done = getattr(self.askuser, 'done', False)
         cfg1.save()
-
-        action['pyson_context'] = PYSONEncoder().encode({
-            'cashbook': getattr(book, 'id', None),
-            'date_from': date_from,
-            'date_to': date_to,
-            'checked': checked,
-            'done': done,
-            })
-        action['name'] = '%(name)s: %(cashbook)s' % {
-                'name': gettext('cashbook.msg_name_cashbook'),
-                'cashbook': getattr(book, 'rec_name', '-/-'),
-            }
+        action.update(self.add_action_data(book))
         return action, {}
 
     def transition_open_(self):
@@ -126,7 +136,7 @@ class OpenCashBook(Wizard):
 # end OpenCashBook
 
 
-class OpenCashBookTree(Wizard):
+class OpenCashBookTree(OLineMixin, Wizard):
     'Open Cashbook2'
     __name__ = 'cashbook.open_lines_tree'
 
@@ -160,17 +170,7 @@ class OpenCashBookTree(Wizard):
                     bookname = book.rec_name,
                     ))
 
-        action['pyson_context'] = PYSONEncoder().encode({
-            'cashbook': getattr(book, 'id', None),
-            'date_from': cfg1.date_from,
-            'date_to': cfg1.date_to,
-            'checked': cfg1.checked,
-            'done': cfg1.done,
-            })
-        action['name'] = '%(name)s: %(cashbook)s' % {
-                'name': gettext('cashbook.msg_name_cashbook'),
-                'cashbook': getattr(book, 'rec_name', '-/-'),
-            }
+        action.update(self.add_action_data(book))
         return action, {}
 
 # end OpenCashBookTree