EXECUTE IMMEDIATE 'BEGIN MV_REFRESH@EPT_CTA('''||'CGT_WLT_SALE'''||','||'''C'''||'); END;';

04052, 00000, "error occurred when looking up remote object %s%s%s%s%s"
// *Cause:  An error occurred when trying to look up a remote object.
// *Action: Fix the error.  Make sure the remote database system has run
//          CATRPC.SQL to create necessary views used for querying or looking up
//          objects stored in the database.

SQL> select count(*) from user_objects@orcl;

  COUNT(*)
----------
        68

SQL> connect / as sysdba
Connected.
SQL> desc dba_db_links
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 OWNER                                     NOT NULL VARCHAR2(30)
 DB_LINK                                   NOT NULL VARCHAR2(128)
 USERNAME                                           VARCHAR2(30)
 HOST                                               VARCHAR2(2000)
 CREATED                                   NOT NULL DATE

SQL> select owner, db_link from dba_db_links where db_link like 'EPT_CTA%';

MV_REFRESH@EPT_CTA('CGT_WLT_SALE','C');