Accessing the run time data of processed output types in VA02

Hello All,
I have to write a code to make entriesin the Ztable when the user processes the output tpe in the VA02 transaction. How I can know that user has attached a new output type for that order?
I am writing my code at the save button of the VA02 tcode in the exit: userexit_save_document.
I checked for the Xnast, ynast, inast entries. But none of them store the current data of the processing of output types screens.
Please help.,
Thanks in advance
Rgds,
Madhuri

data :it_xnast like vnast OCCURS 20 WITH HEADER LINE,
        it_x1nast like vnast OCCURS 20 WITH HEADER LINE.
field-symbols :
            <Fs1> type ZSDTT_VNAST,<Fs2> type ZSDTT_VNAST .
data: wa_xnast type vnast, wa_x1nast type vnast.
         assign ('(SAPLV61B)XNAST[]') TO <fs2>.
         assign ('(SAPLV61B)VNAST[]') TO <fs1>.

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Attachments:
test.zip ‏1 KB

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Accessing the run time data of processed output types in VA02

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