The following ODBC DLL solves the problem reported in APAR 
SA90296. 

Problem description: 

SQLDescribeCol API returns 0 (zero) bytes as the column 
size for CHAR, VARCHAR, LONG VARCHAR, and GRAPHIC columns 
to pre-V4R4 AS/400 systems. 

In order to use this DLL you need to: 

    1.- Stop any ODBC application that is using the Client 
        Access ODBC Driver. 

    2.- Rename the previous CWBODBC.DLL file that is normally 
        located at:

        \Program Files\ibm\Client Aceess\Shared

        This path could be different depending on where you
        specified to install Client Access Express.  

    3.- Download  this DLL file and copy it into the 
        directory where the original file was found. There is 
        no need to restart the computer. 

Note: 

     Before  copying this DLL file,  it is highly recommended  
that the latest Client Access Service Pack be installed on 
your PC.