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All bequeath database links must be loopback database links
Cause: A non-loopback bequeath connect string was supplied for a database link.
Action: Please use a connect string with a different transport protocol, or specify a loopback connect string (one that points to the instance for the current session) using "(PROGRAM=<this instance's ORACLE_HOME>/bin/oracle)" and, optionally, "(ENVS=''ORACLE_SID=<this instance's ORACLE_SID>'')".