cubicweb #3031774 reverse relation: missing documentation? [open]

Have a look at this piece of code from brainomics/views/

... entity.related_study ...
... entity.reverse_holds ...

The Brainomics schemas do have a "related_study" but no "reverse_holds" relation. There is a "holds" relation though.
* I may be wrong, but this does not seem to be documented anywhere.
* Does this mean there can be no relations starting with "reverse_"? Please document this as well.

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