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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/freeipa/ticket/3450

[http://tools.ietf.org/html/rfc2136 RFC 2136] section 1.1.5:

{{{
      CNAME  compare only NAME, CLASS, and TYPE -- it is not possible
             to have more than one CNAME RR, even if their data fields
             differ.
}}}

Fixed upstream:

master:
81be28d6bd49cad19d41a572b0d09c6fe9663359
42c401a87795fe3a2067155460ae276ad2d3e360

Verified against ipa-server-3.3.3-6.el7.x86_64

[root@ipaqavmb ~]# ipa dnsrecord-add $DOMAIN cname --cname-rec $cname
  Record name: cname
  CNAME record: m.l.k.
[root@ipaqavmb ~]# ipa dnsrecord-add $DOMAIN cname --cname-rec "a.b.c"
ipa: ERROR: invalid 'cnamerecord': only one CNAME record is allowed per name (RFC 2136, section 1.1.5)

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.