diff --git a/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkPropagateRelation.java b/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkPropagateRelation.java
index 3e784b07f..2acec6546 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkPropagateRelation.java
+++ b/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/SparkPropagateRelation.java
@@ -73,6 +73,7 @@ public class SparkPropagateRelation extends AbstractSparkAction {
 			.load(DedupUtility.createMergeRelPath(workingPath, "*", "*"))
 			.as(Encoders.bean(Relation.class));
 
+		//<mergedObjectID, dedupID>
 		Dataset<Tuple2<String, String>> mergedIds = mergeRels
 			.where(col("relClass").equalTo(ModelConstants.MERGES))
 			.select(col("source"), col("target"))
@@ -115,25 +116,31 @@ public class SparkPropagateRelation extends AbstractSparkAction {
 			.map((MapFunction<Tuple2<String, Relation>, Relation>) t -> t._2(), Encoders.bean(Relation.class));
 	}
 
+	//redirect the relations to the dedupID
 	private static Dataset<Relation> createNewRels(
-		Dataset<Relation> rels,
-		Dataset<Tuple2<String, String>> mergedIds,
+		Dataset<Relation> rels, //all the relations to be redirected
+		Dataset<Tuple2<String, String>> mergedIds, //merge rels: <mergedObjectID, dedupID>
 		MapFunction<Tuple2<Tuple2<Tuple3<String, Relation, String>, Tuple2<String, String>>, Tuple2<String, String>>, Relation> mapRel) {
 
+		//<sourceID, relation, targetID>
 		Dataset<Tuple3<String, Relation, String>> mapped = rels
 			.map(
 				(MapFunction<Relation, Tuple3<String, Relation, String>>) r -> new Tuple3<>(getId(r, FieldType.SOURCE),
 					r, getId(r, FieldType.TARGET)),
 				Encoders.tuple(Encoders.STRING(), Encoders.kryo(Relation.class), Encoders.STRING()));
 
+		//< <sourceID, relation, target>, <sourceID, dedupID> >
 		Dataset<Tuple2<Tuple3<String, Relation, String>, Tuple2<String, String>>> relSource = mapped
 			.joinWith(mergedIds, mapped.col("_1").equalTo(mergedIds.col("_1")), "left_outer");
 
-		return relSource
-			.joinWith(mergedIds, relSource.col("_1._3").equalTo(mergedIds.col("_2")), "left_outer")
+		//< <<sourceID, relation, targetID>, <sourceID, dedupID>>, <targetID, dedupID> >
+		Dataset<Tuple2<Tuple2<Tuple3<String, Relation, String>, Tuple2<String, String>>, Tuple2<String, String>>> relSourceTarget = relSource
+				.joinWith(mergedIds, relSource.col("_1._3").equalTo(mergedIds.col("_1")), "left_outer");
+
+		return relSourceTarget
 			.filter(
-				(FilterFunction<Tuple2<Tuple2<Tuple3<String, Relation, String>, Tuple2<String, String>>, Tuple2<String, String>>>) r -> r
-					._2() != null || r._1() != null)
+				(FilterFunction<Tuple2<Tuple2<Tuple3<String, Relation, String>, Tuple2<String, String>>, Tuple2<String, String>>>)
+						r -> r._1()._1() != null || r._2() != null)
 			.map(mapRel, Encoders.bean(Relation.class))
 			.distinct();
 	}
diff --git a/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkDedupTest.java b/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkDedupTest.java
index 3dcf61215..bf4913056 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkDedupTest.java
+++ b/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkDedupTest.java
@@ -536,7 +536,7 @@ public class SparkDedupTest implements Serializable {
 
 		long relations = jsc.textFile(testDedupGraphBasePath + "/relation").count();
 
-		assertEquals(4718, relations);
+		assertEquals(4862, relations);
 
 		// check deletedbyinference
 		final Dataset<Relation> mergeRels = spark
diff --git a/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkOpenorgsProvisionTest.java b/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkOpenorgsProvisionTest.java
index 41f81547e..606dd9e5b 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkOpenorgsProvisionTest.java
+++ b/dhp-workflows/dhp-dedup-openaire/src/test/java/eu/dnetlib/dhp/oa/dedup/SparkOpenorgsProvisionTest.java
@@ -57,9 +57,6 @@ public class SparkOpenorgsProvisionTest implements Serializable {
 	private static String testDedupGraphBasePath;
 	private static final String testActionSetId = "test-orchestrator";
 
-	protected static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
-		.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
-
 	@BeforeAll
 	public static void cleanUp() throws IOException, URISyntaxException {
 
@@ -259,7 +256,7 @@ public class SparkOpenorgsProvisionTest implements Serializable {
 
 		long relations = jsc.textFile(testDedupGraphBasePath + "/relation").count();
 
-		assertEquals(2520, relations);
+		assertEquals(4894, relations);
 
 		// check deletedbyinference
 		final Dataset<Relation> mergeRels = spark