How to use sy-ucomm in one time in the report

Hi guru,
I developed a z report when i am executing the report one screen is didplaying and here and here i have to delect some check boxes (update) and then click the click the toolbar stage (which was created using sy-ucomm) and we are getting some output.
Now the requirement is when user second time clicking the  botton stage the report shaould not execute it self.How to do it means how to restrict .Please help me .May be it is easy for you but I am facing a severe probleam to achieve this.
needs yours cooperation and patience.

Hi subhassikan
I am not very clear about what you want to say.
1. you want the sy-ucomm to be executed once right, then you can use a flag in that case.
one it executed first time
make flag = 'X'.
and next time check the value of flag if it is 'X' then the code under sy-ucomm should not be executed.
2. Secondly is there some buttton or something that you click, check function code for only that button and should not execute for any other button and function codes must be different.

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