From the RedHat documentation
<
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/...
:
"Changes made through the IdM web UI, through the IdM command-line tools,
or by editing the LDAP entry directly *do not* update the PTR record. Only
changes made by the DNS service itself trigger PTR record synchronization."
Dynamic updates via nsupdate will automatically sync the PTR record.