Title, barcode and material-type should be mandatory

422 Unprocessable Entity
{
   "errors" : [
      {
         "message" : "may not be null",
         "code" : "-1",
         "parameters" : [
            {
               "key" : "barcode",
               "value" : "null"
            }
         ],
         "type" : "1"
      }
   ]
}