diff --git a/data-viewer/srv/data-service.cds b/data-viewer/srv/data-service.cds
index d03cfce4..606afea2 100644
--- a/data-viewer/srv/data-service.cds
+++ b/data-viewer/srv/data-service.cds
@@ -20,6 +20,7 @@
    * The actual data, organized by column name
    */
   entity Data @cds.persistence.skip {
+    key ID   : String;   // to be OData-compliant
     record   : array of {
       column : String;
       data   : String;
diff --git a/data-viewer/srv/data-service.js b/data-viewer/srv/data-service.js
index 2cddc820..b8a8c14b 100644
--- a/data-viewer/srv/data-service.js
+++ b/data-viewer/srv/data-service.js
@@ -36,8 +36,11 @@ class DataService extends cds.ApplicationService { init(){
     const dataSource = findDataSource(dataSourceName, entityName)
     const res = await dataSource.run(query)
     return res.map((line) => {
-      const record = Object.entries(line).map(([column, data]) => {return {column, data}})
-      return { record }
+      const record = Object.entries(line).map(([column, data]) => ({ column, data }))
+      return {
+        record,
+        ID: cds.utils.uuid() // just to be OData-compliant
+      }
     })
   })