private void checkRequiredExternalIdentifiers( SubmitObjectsRequest req, String[] required, List<ExternalIdentifierType> eis, String prefix) { for (int i = 0; i < required.length; i++) { ExternalIdentifierType ei = XDSTestUtil.removeExternalIdentifier(eis, required[i]); doRegisterDocumentAndCheckError(req, XDSException.XDS_ERR_REGISTRY_METADATA_ERROR, prefix); eis.add(ei); } }