Query regarding events in table maintenance generator

Dear Experts,

In a ztable, I have created a table maintenance generator event 05 (create new entry) for subtracting values from 2 columns and storing the resulting values in the 3rd column. Its working fine. Now the additional requirement is that if the user changes the existing values in the 2 columns, the result should be changed and saved in the 3rd column. I m trying for that but still not got the solution. Can anybody suggest me what event should I use update and save the existing entries?

Regards,

Satvik

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Message was edited by: Vinod Kumar