ABAPer has to check himself before telling the exit is not right one. Pre-requisite for an exit to trigger is --> IT needs to be assigned to a project, (CMOD). When I gave you a tested code in the other post, how can you say the exit is not right one. Copy the code given and use. Check the pre-requisite mentioned.
When you say some thing is not working it is not all. You need to say what is your requirement, what code you are using and what is the result or error you are getting while testing.Things can not be understood by simply telling 'Not working'.