diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/json/input/Common.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/json/input/Common.java
index 3aafe8d..0e0a185 100644
--- a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/json/input/Common.java
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/json/input/Common.java
@@ -58,6 +58,8 @@ public class Common {
 	@CkanResource
 	@NotNull(message="database_source cannot be null")
 	@Size(min=1, message="database_source cannot be empty")
+	@Tag
+	@Group
 	@Valid
 	private List<Resource<Source>> databaseSources;