Trap back button processing and exit transaction and re-enter program.

Hi
I wonder if one of you guru's can help me. We seem to be getting loads of short dumps and I have been assigned the task of looking into it. Basically we have a program that the user runs (transaction FBL5N - Program is RFITEMAR).
When the user executes the program he/she will be presented with a list of customer line item display they then select the items they want to view and press the display icon that gives a more detailed view.
When they press the back button it goes back to the list and they are able to select another item and repeat the above process.
My task is to trap the back button from the deatail screen (the last screen) and after trapping the back button I need to completely exit out of the transaction and then go back in at the point that they were at prior to going into the detailed screen.
This is required as we think everytime the user displays the detail screen the system is grabbing memomry and not relinquishing it.
Many thanks in advance .
Raj
Disagramatically
=============
Currently
=======
screen 1 (selection screen) --> execute
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back
What I require
============
screen 1 (selection screen) --> execute
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back
                  exit transaction and then go to
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back
                  exit transaction and then go to
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back
                  exit transaction and then go to
                  screen 2 --> (select item & press detail icon)
                            screen 3 (detail info) press back

trap the back button
its not at all clear...
ur req is from screen 3 ->display document then on back button
screen 2 the list display...
The report acts in the same way ....

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Trap back button processing and exit transaction and re-enter program.

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