diff --git a/bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Base_getSpecialisedAggregatedAmountList.xml b/bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Base_getSpecialisedAggregatedAmountList.xml
index 2725bafc2804c3e38f178ea58367434feb00fa32..7474c15016bfd79e09f6b33d533919129a4dea86 100644
--- a/bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Base_getSpecialisedAggregatedAmountList.xml
+++ b/bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Base_getSpecialisedAggregatedAmountList.xml
@@ -55,7 +55,7 @@
             <key> <string>_body</string> </key>
             <value> <string>specialise = context.getSpecialiseValue(portal_type=(\'Purchase Trade Condition\',\'Sale Trade Condition\'))\n
 \n
-if specialise:\n
+if specialise is not None:\n
   return specialise.getAggregatedAmountList(context)\n
 \n
 return []\n
@@ -100,6 +100,7 @@ return []\n
                             <string>_getattr_</string>
                             <string>context</string>
                             <string>specialise</string>
+                            <string>None</string>
                           </tuple>
                         </value>
                     </item>
diff --git a/bt5/erp5_trade/bt/revision b/bt5/erp5_trade/bt/revision
index 2764f7b00276b5033fc23bde689b6d3d4cc0fc50..c5321a6e72328aa5f59125f67df79b7d075efa93 100644
--- a/bt5/erp5_trade/bt/revision
+++ b/bt5/erp5_trade/bt/revision
@@ -1 +1 @@
-708
\ No newline at end of file
+709
\ No newline at end of file