diff --git a/__init__.py b/__init__.py
index e8af3da..e5bafe6 100644
--- a/__init__.py
+++ b/__init__.py
@@ -6,6 +6,7 @@
 from trytond.pool import Pool
 from .category import Category
 from .book import CategoryCashbookRel, Cashbook
+from .ir import Rule
 
 
 def register():
@@ -13,4 +14,5 @@ def register():
         Category,
         Cashbook,
         CategoryCashbookRel,
+        Rule,
         module='cashbook_bookcategory', type_='model')
diff --git a/category.xml b/category.xml
index eab3ea6..41b5fbb 100644
--- a/category.xml
+++ b/category.xml
@@ -115,7 +115,7 @@
         </record>
         <record model="ir.rule" id="rg_category_rw_owner-1">
             <field name="domain" eval="[
-                ('create_uid.id', '=', Eval('user', {}).get('id', -1)),
+                ('create_uid.id', '=', Eval('user_id', -1)),
                 ]" pyson="1"/>
             <field name="rule_group" ref="rg_category_rw_owner"/>
         </record>
diff --git a/ir.py b/ir.py
new file mode 100644
index 0000000..0e71a97
--- /dev/null
+++ b/ir.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# This file is part of the cashbook-module from m-ds.de for Tryton.
+# The COPYRIGHT file at the top level of this repository contains the
+# full copyright notices and license terms.
+
+from trytond.transaction import Transaction
+from trytond.pool import PoolMeta
+
+
+class Rule(metaclass=PoolMeta):
+    __name__ = 'ir.rule'
+
+    @classmethod
+    def _context_modelnames(cls):
+        """ list of models to add 'user_id' to context
+        """
+        return super(Rule, cls)._context_modelnames() + [
+            'cashbook.bookcategory']
+
+# end Rule