If you enable the profile option, then you cannot receive the serial number through purchase order receipt, miscellaneous receipt, or account alias receipt, if that ...
If you get curios which level has a profile value, that's the answer.
SELECT SUBSTR (E.PROFILE_OPTION_NAME, 1, 25) PROFILE_NAME,
SUBSTR (POT.USER_PROFILE_OPTION_NAME, 1, 60) USER_PROFILE_NAME,
DECODE (A.LEVEL_ID,
10001, 'Site',
10002, 'Application',
10003, ...