gistfile1.diff

diff -r 91e0c59c47aa tryton/common/domain_parser.py
--- a/tryton/common/domain_parser.py    Thu Jan 03 16:29:35 2013 +0100
+++ b/tryton/common/domain_parser.py	Sat Jan 19 13:33:42 2013 -0800
@@ -749,9 +749,9 @@
         def string_(clause):
             if not clause:
                 return ''
-            if (isinstance(clause[0], basestring)
-                    and (clause[0] in self.fields
-                    or clause[0] == 'rec_name')):
+            if isinstance(clause[0], basestring) and clause[0] not in ('AND', 'OR'):
+                assert clause[0] in self.fields or clause[0] == 'rec_name',
+                    "Field in clause is not available to parser."
                 name, operator, value = clause
                 if name not in self.fields:
                     escaped = value.replace('%%', '__')