Command Query Responsibility Segregation design pattern

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Where should you validate the state of “other” aggregates?

Scenario: A customer places an order, then, after receiving the product, provides feedback on the order process. Assume the following aggregate roots: Customer Order Feedback Here are the ...
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CQRS “private” command

In CQRS, if a saga (or more precisely a process manager according to the CQRS Journey book) sends out a new command to change aggregates how can I ensure that this command is not possible to send from ...
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Entities (DDD) when using CQRS on Akka

When using Akka, CQRS style, is still there a place for Entities? Or does everything now go to Aggregates, implemented as Actors + Value Objects. I notice that most entities are written as mutable ...