diff --git a/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/complete/DumpGraphEntities.java b/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/complete/DumpGraphEntities.java
index 43a569a..78e4eb8 100644
--- a/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/complete/DumpGraphEntities.java
+++ b/dump/src/main/java/eu/dnetlib/dhp/oa/graph/dump/complete/DumpGraphEntities.java
@@ -126,10 +126,10 @@ public class DumpGraphEntities implements Serializable {
 		Optional
 			.ofNullable(d.getPid())
 			.ifPresent(
-				pids -> pids
+				pids -> datasource.setPid(pids
 					.stream()
 					.map(p -> DatasourcePid.newInstance(p.getQualifier().getClassid(), p.getValue()))
-					.collect(Collectors.toList()));
+					.collect(Collectors.toList())));
 
 		Optional
 			.ofNullable(d.getDatasourcetype())