Christian Schröder wrote:
> Indeed, you are right! Granting select permission to the "ts_frontend" 
> user (more precisely: granting membership to the "zert_readers" role) 
> solved the problem.
>
>> This is strange because ts_frontend can select from "EDITORS" because
>> of the membership to role zert_readers.
>
> No, the user "ts_frontend" is (was) not a member of the group 
> "zert_readers", but the user "www" who uses the view is.

My mistake, I got confused in your role hierarchy.
Anyway, the problem is solved, and the cause is clear :^)

Yours,
Laurenz Albe

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