diff --git a/product/ERP5/interfaces/transformation.py b/product/ERP5/interfaces/transformation.py
index 74903564f1808d50441ec07e49b87f474da239f3..2d2d43b2648d583f8f45515a128b1a5ed4e13b9d 100644
--- a/product/ERP5/interfaces/transformation.py
+++ b/product/ERP5/interfaces/transformation.py
@@ -37,14 +37,12 @@ class ITransformation(Interface):
     Models (TaxModelLine, InvoiceModelLine) shall be based on this interface
   """
 
-  def getAggregatedAmountList(context, **kw):
+  def getAggregatedAmountList(context):
     """Returns implementation specific AggregatedAmountList of amounts
     generated by set of rules
 
     context - represents object for which calculation shall happen
 
-    **kw - contains implementations specific parameters
-
     The method returns an instance of AggregatedAmountList class defined
     at ERP5/AggregatedAmountList.py
 
@@ -55,13 +53,11 @@ class ITransformation(Interface):
     """
     pass
 
-  def updateAggregatedAmountList(context, **kw):
+  def updateAggregatedAmountList(context):
     """Updates currently existing movements on delivery
 
     context - represents object on which update shall happen
 
-    **kw - contains implementations specific parameters
-
     The method return a dict of list of movements : 'movement_to_add_list' and
     'movement_to_delete_list'.
     """