diff --git a/product/ERP5/Document/SolverTypeInformation.py b/product/ERP5/Document/SolverTypeInformation.py
index dae03dc79b4a7405da8dd58ade1b110383054a1d..5f45c372163bc480a1e1ab3038873a80ee66c636 100644
--- a/product/ERP5/Document/SolverTypeInformation.py
+++ b/product/ERP5/Document/SolverTypeInformation.py
@@ -29,9 +29,10 @@
 from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions, PropertySheet
 from Products.ERP5Type.ERP5Type import ERP5TypeInformation
+from Products.ERP5.Document.Predicate import Predicate
 from Products.ERP5Type.Cache import getReadOnlyTransactionCache
 
-class SolverTypeInformation(ERP5TypeInformation):
+class SolverTypeInformation(Predicate, ERP5TypeInformation):
   """
     EXPERIMENTAL - DO NOT USE THIS CLASS BESIDES R&D