Text Box drop down limitation in PeopleSoft

Hello Experts,

    I have one  issue while our users were trying to run Processes in the process scheduler. While  the users are trying to run the process, they are getting an error(I presume it is a warning) in the PROCESS SCHEDULER REQUEST. The error(warning) is a below

    MAXIMUM NUMBER OF RECORDS FOUND MATCHING SPECIFIED KEY(S) -- OTHER NOT INCLUDED IN THE LIST. (4,2)

    WHEN PERFORMING A LOOKUP, THE DATABASE RETURNED MORE ROWS THAN CAN BE ACCOMMODATED IN THE LIST BOX.

    USE A PARTIAL KEY VALUE OF ADVANCED SEARCH TO LIMIT THE NUMBER OF ROWS RETURNED OR SPECIFY MORE CHARACTERS TO FURTHER QUALIFY THE KEY VALUE.