Security :: Password Verify Function While Creating A Profile

I've created a password verification function (verify_pwd) in a schema which is not in SYS, but an equivalent of SYS. However, the problem arises when I'm trying to create a profie (MAIN_PROFILE) with the following attributes :

CREATE PROFILE MAIN_PROFILE LIMIT
PASSWORD_LIFE_TIME 90
PASSWORD_VERIFY_FUNCTION verify_pwd;

The above script is resulting in an error.

ORA-02376 : invalid or redundant resource...Can I create the function verify_pwd not in the schema SYS but instead in a schema equivalent to SYS?