Error: -536813545:A duplicate backup sets............

Hi All

I have a CAS 2012 fully updated with a dedup store.

And a MMS 2012 fully updates with another dedup store.

I can, from CAS, make backup to both dedup stores.

I CANNOT make backup to CAS dedup store and then duplicate to MMS dedup store.

When configuring the job I get:

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