DNS using LDAP

I have been trying to find out how to set up OPENLDAP for use with BIND, but have been unable to find anything anywhere on the Internet. If you know where there is documentation, please point me to it.

I am trying to configure DNS using Yast/DNS Server. Everything is OK until I get to “LDAP Support Active” in DNS Zones. When I check that I get the message “Invalid LDAP configuration. Cannot use LDAP”. What do I have to do to configure LDAP so that I can use it? Where is this documented?

I have one machine running Leap 42.3, one with Tumbleweed. I get the same error on both.