Symptom
When you specify a source copy for a secondary copy in Copy Policy tab in the Copy Properties dialog box, an error message might appear when the CommCell the entity that is associated with the source copy is different from the entity that is associated with the secondary copy.
Subclients associated to a secondary copy must also be associated to its source copy
Solution
Before specifying source copy, in the Association tab, make sure that:
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Both the storage policy copies have same CommCell entities (clients or subclient and so on) associated
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The secondary copy has a fewer CommCell entities associated than the source copy
See Assigning CommCell Entities to a Storage Policy Copy for more information on association of CommCell entities to a storage policy copy other than primary copy.