XSODATA

[hongweimiao-eaton]

service {
"db.models::TOQueryAPI_Header.TOHeader" as "TransferOrderHeadSet" key("Lgnum", "Tanum")
navigates ("TransferOrderItemSet" as "to_item");

"db.models::TOQueryAPI_Item.TOItem"
  as "TransferOrderItemSet" key("Lgnum", "Tanum");

association "TransferOrderItemSet" principal  "TransferOrderHeadSet"("Lgnum", "Tanum")
multiplicity "1" dependent "TransferOrderItemSet"("Lgnum", "Tanum") multiplicity "*";

} we can get some results from this service that only have Head data, the item data is empty. How can I prevent the output of such data when the item is empty?