diff --git a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/OOoChart_macroLibrary.xml b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/OOoChart_macroLibrary.xml
index f69ac13019d4b906509a39759214618d662d0610..0f68387b17fcbc479e2a9e065dc67f16a9353b98 100644
--- a/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/OOoChart_macroLibrary.xml
+++ b/product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/OOoChart_macroLibrary.xml
@@ -135,7 +135,7 @@
     <chart:plot-area chart:style-name="chart_picture">\n
       <tal:block metal:define-slot="chart-axis"/>\n
       <tal:block tal:repeat="column_item column_item_list">\n
-        <tal:block tal:define="col_id python:Utils.int2letters(repeat[\'column_item\'].index+1);\n
+        <tal:block tal:define="col_id python:Utils.int2letter(repeat[\'column_item\'].index+1);\n
                    chart_values_cell_range_address string:local-table.$$${col_id}$$2:.$$${col_id}$$${chart_repeated};\n
                    chart_label_cell_address string:local-table.$$${col_id}$$1">\n
           <chart:series tal:condition="python:chart_type != \'chart:circle\'"\n
diff --git a/product/ERP5/bootstrap/erp5_core/bt/revision b/product/ERP5/bootstrap/erp5_core/bt/revision
index e74e6cdbc75f6ad2aa16aa50717743794ddf5465..14ffac1dfe38c962eaf9c1ae0dc76504afc81e16 100644
--- a/product/ERP5/bootstrap/erp5_core/bt/revision
+++ b/product/ERP5/bootstrap/erp5_core/bt/revision
@@ -1 +1 @@
-1137
\ No newline at end of file
+1138
\ No newline at end of file