MV Log used by three databases

My scenario is as follows:

I have the table "X" in database "A" and created a MV log with the command:

CREATE MATERIALIZED VIEW LOG ON X WITH PRIMARY KEY, ROWID;

Now, I created in the database "B" a MV with the command:

CREATE MATERIALIZED VIEW "MVX_B"   

   REFRESH FAST START WITH SYSDATE NEXT SYSDATE + 1/720

   WITH PRIMARY KEY 

   AS SELECT * FROM X@A;

And created in the database "C" a MV with the command:

CREATE MATERIALIZED VIEW "MVX_C"

    REFRESH FAST START WITH SYSDATE NEXT SYSDATE + 1/720

    WITH PRIMARY KEY

    AS SELECT * FROM X@A;

Finally I created in the database "D" a VM with the command: