When RFC2307bis-based schema was added to FreeIPA and Fedora Directory in 2008, wrong OID was used for nisDomain attribute compared to the actual RFC2307bis schema. FreeIPA installed own schema version by default as rfc2307bis.ldif first and then as 15rfc2307bis.ldif. Fedora Directory (later 389-ds) kept it as 60nis.ldif in the optional content and never installed it into a working instance.

Recently, 389-ds decided to unify various RFC 2307-related schema files and install them by default. As result, FreeIPA-provided nisDomain attribute started to conflict with the one installed by default by 389-ds.

All other attributes from 15rfc2307bis.ldif are not in use by FreeIPA. Since they are provided in 389-ds starting with 1.4.3.5 anyway, it makes no sense to keep them shipped.