Hi, here are some more details.  The main called interface flow  are follow:   // Called REST API. 1. Query gid: http://XXXXXX.com:xxxx/api/1.0/reservationgroups; 2. Query rid by gid and hardWardid: http://XXXXXX.com:xxxx/api/1.0/reservationgroups/gid/reservations/?hostId=" + hardWareId; 3. Delete the License by gid and rid(use DELETE method): http://XXXXXX.com:xxxx/api/1.0/reservationgroups/gid/reservations/rid; 4. Add License by gid and hardWardId(use POST method): http://XXXXXX.com:xxxx/api/1.0/reservationgroups/gid/; String reqBody = "{ \"hostId\": { \"value\": \"" + hardWareId + "\", \"type\": \"STRING\" } , \"reservationEntries\": " + features + " }";} Now current we encounter two problems: The LLS will return uncertain results(eg:   Service is busy processing reservations,   glsErr.dbFailure), the detail error log can get from attachment: debug.log; Call the delete and add REST API is slow, it need maybe takes 5-8 minutes get the result. ... View more