BEX Date Variable to Pass values to multiple date characterstics

Hi ,

I have Startdate and Createdate characteristics in my BEX designer characteristics restrictions. I need to create a variable for mandatory date range which  need to prompt only once in WEBI/RSRT and Values I entered should be applied on both startdate and createdate.

I tried creating variables on Calenderday but as I cannot use same variable for both dates I end up creating two variables hence I am seeing two prompts once for each date.

Please provide inputs.

Thanks,
Raja