diff --git a/product/ERP5/Document/TradeModelLine.py b/product/ERP5/Document/TradeModelLine.py
index 708009d39f0add7917a96b21564df762468756ed..d497836c29d9a57985433600be7494ac559015fc 100644
--- a/product/ERP5/Document/TradeModelLine.py
+++ b/product/ERP5/Document/TradeModelLine.py
@@ -32,11 +32,12 @@ from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions, PropertySheet, interfaces
 from Products.ERP5Type.XMLMatrix import XMLMatrix
 from Products.ERP5.Document.Amount import Amount
+from Products.ERP5.Document.Predicate import Predicate
 from Products.ERP5Type.Utils import cartesianProduct
 from Products.ERP5.AggregatedAmountList import AggregatedAmountList
 import zope.interface
 
-class TradeModelLine(XMLMatrix, Amount):
+class TradeModelLine(Predicate, XMLMatrix, Amount):
     """Trade Model Line
     """
     meta_type = 'ERP5 Trade Model Line'
@@ -59,6 +60,7 @@ class TradeModelLine(XMLMatrix, Amount):
                     , PropertySheet.Price
                     , PropertySheet.TradeModelLine
                     , PropertySheet.Reference
+                    , PropertySheet.Predicate
                     )
 
     def getPrice(self):