@RequestMapping(path = "submissionEnvelopes/{sub_id}/processes", method = RequestMethod.POST)
    ResponseEntity<Resource<?>> addProcessToEnvelope(@PathVariable("sub_id") SubmissionEnvelope submissionEnvelope,
                                                     @RequestBody Process process,
                                                     @RequestParam("updatingUuid") Optional<UUID> updatingUuid,
                                                     PersistentEntityResourceAssembler assembler) {