(Quick Reference)
                Service: Save
Description: This web service is used to add a new unit object into the database
URL: 
https://BASE_URL/api/VERSION/units
 Method: POST
Request content type: application/json
Parameters:
| Name | Description | Type | Required | Example values | 
|---|
| reference | the reference of the new unit | String | Yes |   | 
| name | the name of the new unit | String | Yes |   | 
reference must be unique
Success Output
 Success case: response.status=201 
{
    "id": 16,
    "name": "packet",
    "reference": "PA",
    "organization": "Lyon",
    "dateCreated": "2016-08-18T12:53:26Z",
    "lastUpdated": "2016-08-18T12:53:26Z"
} 
 Failure Output
 Failure case:response.status = 400 
{
    "error": "missing_param",
    "error_description": "reference parameter is missing"
} 
{
    "error": "not_unique",
    "error_description": "reference already used"
} 
{
     "error": "save_failed",
     "error_description": "Failed to save instance"
} Failure case:response.status = 500 
{
    "error": "server_error",
    "error_description": "Oops! Something went wrong..."
}