diff --git a/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/projecttoresult/ProjectResultSet.java b/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/projecttoresult/ProjectResultSet.java
index 39af1f59c1..da1be3b69d 100644
--- a/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/projecttoresult/ProjectResultSet.java
+++ b/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/projecttoresult/ProjectResultSet.java
@@ -1,4 +1,25 @@
 package eu.dnetlib.dhp.projecttoresult;
 
-public class ProjectResultSet {
+import java.io.Serializable;
+import java.util.ArrayList;
+
+public class ProjectResultSet implements Serializable {
+    private String projectId;
+    private ArrayList<String> resultSet;
+
+    public String getProjectId() {
+        return projectId;
+    }
+
+    public void setProjectId(String projectId) {
+        this.projectId = projectId;
+    }
+
+    public ArrayList<String> getResultSet() {
+        return resultSet;
+    }
+
+    public void setResultSet(ArrayList<String> resultSet) {
+        this.resultSet = resultSet;
+    }
 }