Sieve body extension

Hello.

I'm trying to push a sieve script to a Cyrus IMAP 3.0.16 server.

The script starts with:
> require ["body"];

sieveshell, however, says
> upload failed: put script: line 1: Unsupported feature(s) in "require": "body"



Quoting https://www.cyrusimap.org/3.0/imap/reference/admin/sieve.html:

> Sieve has a lot of extensions. Cyrus supports a subset of these:
> ...
 > Body Extension RFC 5173



So is this supported or not?
Must it be enabled somehow?
Or am I doing it wrong?

  bye & Thanks
        av.

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