How to upload database tab(ztable) before executing of report

hi all,
I have developed a report , in which i have a check box in selection screen, when ever i check this and give inputs to report(year, period), upto that year and period , the database table(ztable), have to be updated (the data is inturn fetched from standarad database table and inserted into my ztable)and that results from the ztable are selected in report.Can any one help me where i shoud write code for this(is it in at selection screen) or not.what commands i have to use to achieve this. Can any one suggest me how to do this, if possible with a sample code

Kiran,
In your report first select the data from the standard table and update the ztable and then display the output fetched from the ztable.
I guess the selection criteria that you are using for fetching from the standard table and selection criteria that you intend to fetch from the ztable for displaying the output are the same.If it is not then do the filtering in the program as per your need and then display the output.
By the way I didn't get why you need a ztable when already the data is available in the standard table.
K.Kiran.

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plz sent the detail description as well sa sample programs

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