diff -r 582301c2c8ca -r 2daa5c6dea4d entities/__init__.py
--- a/entities/__init__.py	Fri Feb 13 13:39:33 2015 +0100
+++ b/entities/__init__.py	Fri Feb 13 14:32:15 2015 +0100
@@ -53,7 +53,7 @@
         """
         restrictions = ['X is %s' % cls.__regid__]
         selected = ['X']
-        for attrschema in cls.e_schema.indexable_attributes():
+        for attrschema in sorted(cls.e_schema.indexable_attributes()):
             varname = attrschema.type.upper()
             restrictions.append('X %s %s' % (attrschema, varname))
             selected.append(varname)