Hello everyone, I have set up the reception of hl7 messages, and a working list is also created based on the messages, but the problem is that when I request the list from the server, not all the data comes in response to the request, although it is filled in. 
here is a request to the server and receiving a response
No data is sent to the server upon request, although it is definitely there. 
(0040,0001) AE (no value available)                     #   0, 0 ScheduledStationAETitle 
(0008,0061) CS (no value available)                     #   0, 0 ModalitiesInStudy

I need these two parameters because there is a lot of equipment in the medical facility and I need each device to be able to request only the prescribed procedures. 
Please tell me what I'm doing wrong, or where these settings are configured. 
Thank you for your help