as-set and origin as usage

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Hello everybody,

A few days ago I intended a RIPE RPSL training.
Now I'm writing a summary for my colleagues and there something I don't
remember perfectly, it's about the as-set object.

Using an as-set object, I can either start its name with an origin as or
directly put the name (ex. AS-Customers).
Under which circumstance should I specify the origin AS?

Thank you very much for your help,

Regards,