Entity Reference create problem with REST server using Services i'm building a web services and now i'm writing the documentation for the mobile developer.

When i want to create/modify an entity reference Services 3 ask a stucture like this

"field_organization": {
    "und":[{
        "target_id":"Organization name (69)"
    }]
  }


for a field like this



but, there is another way to give only the nid without the node title? It could be more handy.

I read something like 

"field_organization":[{
     "target_id":{
                "target_id":"[nid:69]"
          }
   }]


or like 

   "field_organization": {
       "und":[{
             "target_id":{
                 "target_id":"[nid:69]"
               }
           }]
     }


on the official documentation but it didn't work. 

Can someone know a method to give only the nid of a Entity reference field?
I found the solution!
The required data structure depends on the input widget, since Services uses the form submit handlers (which may be a major design flaw).
For "Autocomplete/Tagging" the label (id) thingy is necessary. But if you switch to checkboxes it reads "field_reference": { 1:1, 2:2,  ... ,nid:nid} and for select box "field_reference": [1,2,3 ... nid].

The REST-API depends on the widgets the frontend uses ... but at least it works. I guess its upside is that REST-posts are validated just as normal form inputs are. I'll also have a look at the approach implemented http://drupal.org/project/restws