OpenDJ SDK Developer's Guide
Chapter 10. Working With Controls

Microsoft defined a Permissive Modify Request Control that relaxes some constraints when your application performs a modify operation and tries to add an attribute that already exists, or to delete an attribute that does not exist.

if (isSupported(PermissiveModifyRequestControl.OID)) {
    final String dn = "uid=bjensen,ou=People,dc=example,dc=com";

    final ModifyRequest request =
            Requests.newModifyRequest(dn)
                .addControl(PermissiveModifyRequestControl.newControl(true))
                .addModification(ModificationType.ADD, "uid", "bjensen");

    connection.modify(request);
    System.out.println("Permissive modify did not complain about "
            + "attempt to add uid: bjensen to " + dn + ".");
}

OpenDJ directory server supports the Permissive Modify Request Control:

Permissive modify did not complain about attempt to add
 uid: bjensen to uid=bjensen,ou=People,dc=example,dc=com.