Accessor/Base.py: allow tales expressions as base types

product/ERP5Type/Accessor/Base.py

@@ -35,6 +35,7 @@ from Acquisition import aq_base
 from zLOG import LOG
 from DateTime import DateTime
 
+from Products.CMFCore.Expression import Expression
 from Products.ERP5Type.Cache import CachingMethod
 from Products.ERP5Type.PsycoWrapper import psyco
 from AccessControl.ImplPython import rolesForPermissionOn
@@ -56,6 +57,8 @@ builtin_type_tuple = (
   types.ListType,
   types.DictType,
   DateTime,
+  # It seems some magic converts automatically string in Tales Expression if they follow some format
+  Expression,
 )
 
 class Setter(Method):