Revise with Importable spreadsheet

when revise is done with importable spreadsheet. The version number changes in Windchill, however it shows as a new iteration rather than a revision. 

Here the part was revised in windchill and in history it shows "New Revision 2"

When using the importable spreadsheet to create the new version 3 in history it shows "New Iteration 3.2"

How can we do a revise using importable spreadsheet rather than creating a new iteration?
Note: modify and revise permission are granted