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ORA-06596:

unsupported LOB operation in RPC call
Cause: An attempt was made to perform certain LOB operations (for example, deep copying of a temporary or abstract LOB on the client-side) while performing an RPC. This is not currently supported.
Action: Perform the LOB operation in question before starting the RPC; or perform those LOB operations which are not actually executed on the client-side, on the server-side.