Are you asking how to do this or are you having a problem with an existing program. If it is the latter, then what problem are you having?
A READ trigger receives a <i>copy</i> of the buffer that is passed to the program, not the buffer itself. Whatever the READ trigger does to the data will not be seen by any program. (Nor <i>should</i> it be seen by the application!)
Thanks for the quick response.
But, is there a way around that?
In other words, we need to do kind of “our own field-level security”, without modifying too many programs. I thought the Read-Trigger would help in that.