APPS.FND_MESSAGE dependencies on DUAL

Line 682: select user into username from dual;

678: username varchar2(2000);
679: apps_schema_name varchar2(2000);
680: begin
681:
682: select user into username from dual;
683:
684: select distinct oracle_username into apps_schema_name from fnd_oracle_userid where upper(read_only_flag)='U';
685:
686: if(upper(username) <> upper(apps_schema_name) ) then