Restrict Duplicate print of receipt smartform for specific users

Hi Folks,

I have a custom driver program to print Customer Receipt and everything is working fine. But now I have a requirement saying I have to restrict the print option to specific user in case of print of Customer Receipt more than once.

I found a parameter TDAUTORITY in smartform control structure SSFCOMPOP but since there is no documentation for this structure, I have no idea what is this parameter for.

So, request you if you could guide through how to meet my requirement of restricting duplicate print for userids.

Thank you.

Regards,

Sud.