opted out

I've tried to do a status change on OPTED_OUT package to DRAFT (edit data, then set it to SENT). Request

PUT /api/packages/PACKAGE_ID HTTP/1.1
Accept:  application/json,application/zip,application/pdf,text/html; esl-api-version=10.7
Accept-Encoding: gzip, deflate
Authorization: Basic XXX
Connection: keep-alive
Content-Length: 19
Content-Type: application/json
Host: sandbox.esignlive.com

{
    "status": "DRAFT"
}

Response:

HTTP/1.1 500 Internal Server Error
Connection: keep-alive
Content-Type: application/json
Date: Wed, 15 Feb 2017 10:35:5