ipa migration fails with the error: "u7504xx: attribute "displayName" not allowed"

Issue

ipa migration fails with the error: "u7504xx: attribute "displayName" not allowed"

When migrating LDAP entries(user & groups) from Sun Java Directory Server(6) to Idm(ipa-server 4.5.0). The following attributes are not allowed.
displayName
initials
givenName

ipa -v migrate-ds --schema=RFC2307 ldap://<sun_server>:389 --bind-dn="cn=Directory Manager" --base-dn="dc=example,dc=com" --user-container="ou=people,dc=example,dc=com" --user-objectclass=posixAccount  --user-objectclass=account --user-objectclass=top  --user-ignore-objectclass={organizationalPerson,inetOrgPerson} --group-container="ou=group,dc=example,dc=com" --group-objectclass="posixGroup" --group-overwrite-gid --continue

--snip --
  u7504xx: attribute "displayName" not allowed
  u7503xx: attribute "displayName" not allowed