diff --git a/product/ERP5/Document/TradeModelLine.py b/product/ERP5/Document/TradeModelLine.py
index 1a881e98c9a5e5d9b0f2cc4923ec4abef2f5987b..2a0173bf83a141cf8151dd536f374bc977d7617b 100644
--- a/product/ERP5/Document/TradeModelLine.py
+++ b/product/ERP5/Document/TradeModelLine.py
@@ -30,14 +30,16 @@
 from AccessControl import ClassSecurityInfo
 
 from Products.ERP5Type import Permissions, PropertySheet, Constraint, Interface
+from Products.ERP5Type.XMLMatrix import XMLMatrix
 
 from Products.ERP5.Document.Amount import Amount
+from Products.ERP5.Variated import Variated
 
 from Products.ERP5.AggregatedAmountList import AggregatedAmountList
 
 import zope.interface
 
-class TradeModelLine(Amount):
+class TradeModelLine(XMLMatrix, Amount, Variated):
     """Trade Model Line
     """
     meta_type = 'ERP5 Trade Model Line'