Well, i found a solution for this one..
Unlike previous versions, codewarrior v9.2 does not support the use of "Delete" button from the keyboard to use in the write tab of hardware disgnostics window. After selecting the default value you can not even write new values.
To solve this, select the default value and use the "Backspace" button to delete the contents or right click on the default value of write tab and click delete. Now that the old value is deleted, you can write new values to your write tab.