How to fetch enrollment start date in Absence validation fast formula

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hi All,

         I am trying to fetch enrollment start date in the absence validation fast formula. Now I found "ABS_PLN_ENT_CURR_START_DATE" which is a date number array and I am not getting a single static value for the enrollment start date. I need this data to identify how many days have passed since the person has enrolled in the plan. 

Can someone help me get the correct DBI or correct way to fetch the enrollment start date in the fast formula?