User exit in ob28

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Hi gurus
I need a explanation how the user exit work in the ob28, this is the first time that i deal with this, and i need to apply the 650827 and it involve a user exit.
i dont know what to fill out in prerequisites and check area when in using a exit.
if you have an example about a validation step , with the prerequisites and check area using a user exit, please post it, with the explanation.
Thks
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Hi
For an example if you need to restrict access T-code FB02 by use ABC write validation like follows
In Prerequisite :
Transaction code = 'FB01'  AND User Name = 'ABC'
Check :
False
Message :
Message Type : E
Create a Message No and include a message as you wish
Kesh.