WORKAROUND
Run the following permissions statements to support both two parameters and three parameters
grant execute on function SYSPROC.MON_GET_CONNECTION(BIGINT,INTEGER) TO USER @quest_replace_user;
grant execute on function SYSPROC.MON_GET_CONNECTION(BIGINT,INTEGER,SMALLINT) TO USER @quest_replace_user;
grant execute on function SYSPROC.MON_GET_UNIT_OF_WORK(BIGINT,INTEGER) TO USER @quest_replace_user;
grant execute on function SYSPROC.MON_GET_UNIT_OF_WORK(BIGINT,INTEGER,SMALLINT) TO USER @quest_replace_user;
STATUS
This is listed as known issue DB2FOG-165.