Cause
one or more of the columns in the column list of the multi datastore are of a type which the multi datastore is unable to process
one or more of the columns in the column list of the multi datastore are of a type which the multi datastore is unable to process
change the column list of the multi datastore to contain only supported types. PL/SQL functions can be used in the comlumn list to convert unsupported types to supported types.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/drgus.htm
https://community.oracle.com/message/9490757
https://community.oracle.com/message/9747477
https://community.oracle.com/message/9747474
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