CA VM:Backup calls the user exit with the CA VM:Backup default start and end dates specifying the FORDATE keyword to obtain the authorized time period (fromdate and todate respectively) before displaying the main menu on which fromdate appears. If the user changes the fromdate on the Novice User Main Menu, CA VM:Backup calls VMBEXIT3 with the FORDATE keyword again with the fromdate specified by the user and the default todate.
If the dates returned by VMBEXIT3 are valid, the restore request continues. If the dates are not valid, CA VM:Backup issues a message explaining that the dates returned to CA VM:Backup are invalid. This indicates a coding error in the user exit; the user cannot restore.
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