excel parser - additional properties

Hi 

I have these columns in my Excel file:

Column 1 - ID number

Column 2 - Source text

Column 3 - Target text

Column 4 - Text type

Column 5 - Description of usage

When I configuring the Excel parser up, I set:

column 4 to be "Comment column"

column 5 to be "Columns with additional properties".

When I look at the generated translation list, I can only see the contents of column 4.

Column 5 is nowhere to be seen.

Can someone tell me how i can get  both column 4 AND column 5 to appear in the translation list?

Thanks

Mark