How to set reference variables in Catalog API posts

[mtuman]

I'm currently working with the ServiceNow Catalog Rest API in Java. I have successfully added items to my cart and submitted my cart, however whenever a variable in the body of my post is of type reference I am unable to set it's value. The ticket that gets created is just empty in these fields. Below is a small example of my code.

   HttpPost post = new HttpPost();


   post.setURI(new URI("https://myinstance/api/sn_sc/servicecatalog/items/" + itemId + 
   "/add_to_cart"));

   String encoding =
   Base64.getEncoder().encodeToString(("User:Password").getBytes("UTF-
   8"));

   String authHeader = "Basic " + encoding;

   post.setHeader(HttpHeaders.AUTHORIZATION, authHeader);

   post.setHeader("Content-Type", "application/json");

   /*WorkgroupAssignment is of type reference and never gets set.While 
     short_description' always gets set.*/

   String data = "{'sysparm_quantity': 1,'variables': {'short_description': 
  'Example description','WorkgroupAssignment':'TSU-Middleware'};

   StringEntity entity = new StringEntity(data);

   /**
     * *******************
     * and now the body.. 
     * *******************
   */

   post.setEntity(entity);

WorkgroupAssignment is of type reference. Is there something special I have to do to set variables of type reference?

Thanks

[dvp]

The only issue i see here is you are missing closing brace } in the body

Here is the format

{
'sysparm_quantity': 1,
'variables': {
'short_description': 'Test description',
'WorkgroupAssignment':'89e10e5d1f654ec9a627bbef202af78c'
}
}

[mtuman]

Sorry...in my actual code I have that closing brace. I guess when I copied and pasted I left it out

[dvp]

and is '89e10e5d1f654ec9a627bbef202af78c' sys_id from groups table?

and does the integration user has access to the particular group record?