how to trace change of field in SM30 Table maintenance generator

hi,

i have a SM30-view. In SE11 i have the possibility to use events in table maintenance generator. (under Modification -> Events in the menu).

There i have the different Table maintenance dialog events (01, 02, etc...........).

No i want to do the following:

i want to know when a specific field in the table is changed after saving the data in SM30.

how can i handle this ? which event i have to use ?

br, Martin