RMAN Catalog 12.1 cannot be exported without EXEMPT ACCESS POLICY

RMAN:  12.1.0.2

Database 12.1.0.2

I created the RMAN Catalog 12.1 in its own schema (RMAN_CAT_12) in a 12.1.0.2 database with the CREATE CATALOG command.  It's working well.

I run nightly exports of the entire database.

Now that I've added the catalog to this database, the expdp fails with multiple ORA-39181: Only partial table data may be exported due to fine grain access control on "RMAN_CAT_12".<object>.

ORA-39181:Only Partial Table Data Exported Due To Fine Grain Access Control (Doc ID 422480.1)

Talks about how to get around this by granting system privilege EXEMPT ACCESS POLICY to the user exporting the schema. 

The exports are done as SYSTEM, so I did so.  It now works.