(Quick Reference)
                Service: Show
Description: This web service return an existing item group details of the specified id in JSON format
URL: 
https://BASE_URL/api/VERSION/itemGroups/{id}: 
https://BASE_URL/api/VERSION/itemGroups/reference/{id}: GET
Parameters:
| Name | Description | Type | Required | Example values | 
|---|
| id | id of the wanted item group | Long/String | Yes | 777 | 
Success Output
 Success case: response.status=200 
{
    "id": 21,
    "reference": "RG-1",
    "name": "ItemGroup1",
    "description": null,
    "organization": "Lyon",
    "dateCreated": "2016-08-18T10:24:27Z",
    "lastUpdated": "2016-08-18T10:24:27Z"
} Failure Output
 Failure case:response.status = 404 
{
    "error": "not_found",
    "error_description": "The item group with the id 3 doesn't exist."
} Failure case:response.status = 400 
{
    "error": "invalid_param_type",
    "error_description": "The type of parameter id you provided is not valid for this request."
}