BAPI_BUPA_SEARCH - MAXSEL

I have an RFC that does business partner search using BAPI_BUPA_SEARCH. I want the ability to restrict the number of business partner retrieved.

The bapi has a structure OTHERS. In it there is is a field MAXSEL. I specify 20 for MAXSEL in BAPI signature but still get more than 20 BPs.

How is MAXSEL used?