Go into Student Admissions > Application Maintenance > Maintain Applications. Make sure “Include History” mode is checked, and that only “Emplid” and “Institution” are filled in (delete “Application Program Nbr” if one’s there – it usually defaults to 0).
Search, choose the right application (if the student has multiple), and go to the 4th tab - "Application Program Data." Go to the earliest row for this record (their Application row). Take note of the admit term, effective date, and effective sequence here.