I wouldn't recommend using resereved field (like USERID in your case) for data reduction. In the following example, I changed USERID to USER_ID in the section application, and added a field specifically for data reduction, called it REDUCTION. Notice that the value of this field for ADMIN is * - that means all listed values.
LOAD * INLINE [
ACCESS, USERID, PASSWORD, REDUCTION
ADMIN, ADMIN, ADMIN, *
USER, MSR, MSR, MSR
USER, KSR, KSR, KSR