Fuzzy Lookup Reference Table issue

hi All,

I faced the problem that I spend few day to find the solution but not found.
that is, I create a new index with maintenance features and then use the existing same index.

After insert new record into reference table it works fine, but unfortunately, when use update/delete it turns failed.

I don’t know what happened on it?
Couldn’t the reference table be dynamic? or there exists some alternatives?

It’s really appreciate for your help!!
thanks in advanced.

Jackie