hi everybody

when I install a replica and have DNS use cname records to a classless zone I see:

Configuring DNS (named)
  [1/8]: generating rndc key file
  [2/8]: setting up our own record
  [error] ValidationError: invalid 'cnamerecord': CNAME record is not allowed to coexist with any other record (RFC 1034, section 3.6.2
..

This happens if the replica has existing ptr record at the time of installation.
If I remove ptr record for the replica from the parent reverse zone (all managed by the same IPA) then installation proceeds but should masters' records in reverse zone be in resolved with/via cnames in classless subnet? (which howto says it should - https://www.freeipa.org/page/Howto/DNS_classless_IN-ADDR.ARPA_delegation)
Or should IPA be not hosting the parent zone if itself is in a classless IP subnet?
It's bit confusing to me I confess.

many thanks, L.