FND Messages API is not returning the message text with substituted token values

Tried calling the standard API as a stand-alone call. It did not work in both cases.

Pasting the content below from the word document for your easy reference:

set serveroutput on

declare

l_chr_msg varchar2(4000);

begin

apps.fnd_message.set_name ('XXCORP', 'HNI_CZ_MODEL_SEGS_MISMATCH_MSG');

apps.fnd_message.set_token ('BASE_MODEL', 'H312');

apps.fnd_message.set_token ('N', '2');

l_chr_msg := apps.fnd_message.get;

dbms_output.put_line(l_chr_msg);

end;

Result

anonymous block completed

HNI_CZ_MODEL_SEGS_MISMATCH_MSG (BASE_MODEL=H312) (N=2)

The expected result was H312 expects 2 segments