ir-rule: condition --> Eval('user_id', -1)

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