Propagate message to a particular database queue

Dear all

I have three test databases MYDB, PLDB, and MYSITE in the same server. I have queue in each database and propagation schedule from database MYDB to PLDB and MYDB to MYSITE. When I am using the following PL/SQL to enqueue the message in MYSITE the message get propagated to all (MYSITE and PLDB) database successful

DECLARE

   enqueue_options    DBMS_AQ.ENQUEUE_OPTIONS_T;

   message_properties DBMS_AQ.MESSAGE_PROPERTIES_T;

   message_handle     RAW(16);

   message            strmadmin.mydb_rtgs_tp;

BEGIN

   message := strmadmin.mydb_rtgs_tp(

                data  => 'Test Hello'            

                );

   DBMS_AQ.ENQUEUE(

      queue_name         =>'strmadmin.mydb_rtgs_qu',

      enqueue_options    => enqueue_options,