how to redirect user variable to the error table after derived column

hi folks:

  I have a simple package that loops flatfile data for each year and dump into a table. I've created a user variable @user:: CounterLoop to control the loop.  My goal is to redirect errors whenever an error occurs in the derived column .

However, when I double click "OLE DB Destination 4 " and go to the Mappings part, I am unable to find this user variable in the available Input Columns. 

My question is how to direct this user variable to the error output for trouble shooting purpose? 

Thanks



--Currently using Reporting Service 2000; Visual Studio .NET 2003; Visual Source Safe SSIS 2008 SSAS 2008, SVN --