Sounds like a homework question. Why can’t an override be used?? philpl1jb’s answer is probably the easiest. There are other solutions like creating a LF for each member you want and query those new LF’s.
It’s not an “override” in the sense that you are using an OVRDBF command but another view of the database. There are most likely other methods but we would need to know more about the project in question.