in timebase-kafka-connector/src/main/java/deltix/kafka/connect/RawMessageSerializer.java [461:470]
private void validateNewField(Schema schema, String newField) {
if (fieldMap.hasDestinationAlias(newField))
throw new IllegalArgumentException("Specified new field name \"" + newField + "\" is already used as a field alias");
if (schema.field(newField) != null && !fieldMap.hasSourceAlias(newField))
throw new IllegalArgumentException("Schema already contains specified new field: " + newField);
if (fieldMap.isFieldPath(newField))
throw new IllegalArgumentException("Specified new filed name \"" + newField + "\" contains path separator character");
}