I have a report that shows when a client is discharged from a Mental Hospital (in the main report) and then in a subreport when thier next Outpatient service was delievered.  I want to know their next 3 services.  In the subreport the group sort expert is greyed out.  Is there a way to write a group selection formula for the next 3 dates after the discharge date?  I appreciate any help.

 

Thank you,

 

Kevin