diff --git a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareBipFinder.java b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareBipFinder.java
index c7049430e..ab740a024 100644
--- a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareBipFinder.java
+++ b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareBipFinder.java
@@ -6,10 +6,12 @@ import static eu.dnetlib.dhp.actionmanager.bipmodel.Constants.UPDATE_CLASS_NAME;
 import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;
 
 import java.io.Serializable;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
+import eu.dnetlib.dhp.schema.oaf.Instance;
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.JavaRDD;
@@ -39,7 +41,7 @@ public class PrepareBipFinder implements Serializable {
 	private static final Logger log = LoggerFactory.getLogger(PrepareBipFinder.class);
 	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
 
-	public static <I extends Result> void main(String[] args) throws Exception {
+	public static  void main(String[] args) throws Exception {
 
 		String jsonConfiguration = IOUtils
 			.toString(
@@ -75,7 +77,7 @@ public class PrepareBipFinder implements Serializable {
 			});
 	}
 
-	private static <I extends Result> void prepareResults(SparkSession spark, String inputPath, String outputPath) {
+	private static void prepareResults(SparkSession spark, String inputPath, String outputPath) {
 
 		final JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext());
 
@@ -95,7 +97,9 @@ public class PrepareBipFinder implements Serializable {
 				Result r = new Result();
 
 				r.setId(DHPUtils.generateUnresolvedIdentifier(v.getId(), DOI));
-				r.setMeasures(getMeasure(v));
+				Instance inst = new Instance();
+				inst.setMeasures(getMeasure(v));
+				r.setInstance(Arrays.asList(inst));
 				return r;
 			}, Encoders.bean(Result.class))
 			.write()
diff --git a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/SparkSaveUnresolved.java b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/SparkSaveUnresolved.java
index 918f6a417..1a115e18f 100644
--- a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/SparkSaveUnresolved.java
+++ b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/SparkSaveUnresolved.java
@@ -20,7 +20,7 @@ import eu.dnetlib.dhp.application.ArgumentApplicationParser;
 import eu.dnetlib.dhp.schema.oaf.Result;
 
 public class SparkSaveUnresolved implements Serializable {
-	private static final Logger log = LoggerFactory.getLogger(PrepareFOSSparkJob.class);
+	private static final Logger log = LoggerFactory.getLogger(SparkSaveUnresolved.class);
 
 	public static void main(String[] args) throws Exception {
 
@@ -64,7 +64,7 @@ public class SparkSaveUnresolved implements Serializable {
 			.map(
 				(MapFunction<String, Result>) l -> OBJECT_MAPPER.readValue(l, Result.class),
 				Encoders.bean(Result.class))
-			.groupByKey((MapFunction<Result, String>) r -> r.getId(), Encoders.STRING())
+			.groupByKey((MapFunction<Result, String>) Result::getId, Encoders.STRING())
 			.mapGroups((MapGroupsFunction<String, Result, Result>) (k, it) -> {
 				Result ret = it.next();
 				it.forEachRemaining(r -> ret.mergeFrom(r));
diff --git a/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareTest.java b/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareTest.java
index c48ccc8c2..eb9956d80 100644
--- a/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareTest.java
+++ b/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareTest.java
@@ -96,13 +96,15 @@ public class PrepareTest {
 		String doi1 = "unresolved::10.0000/096020199389707::doi";
 
 		Assertions.assertEquals(1, tmp.filter(r -> r.getId().equals(doi1)).count());
-		Assertions.assertEquals(3, tmp.filter(r -> r.getId().equals(doi1)).collect().get(0).getMeasures().size());
+		Assertions.assertEquals(1, tmp.filter(r -> r.getId().equals(doi1)).collect().get(0).getInstance().size());
+		Assertions.assertEquals(3, tmp.filter(r -> r.getId().equals(doi1)).collect().get(0).getInstance().get(0).getMeasures().size());
 		Assertions
 			.assertEquals(
 				"6.34596412687e-09", tmp
 					.filter(r -> r.getId().equals(doi1))
 					.collect()
 					.get(0)
+							.getInstance().get(0)
 					.getMeasures()
 					.stream()
 					.filter(sl -> sl.getId().equals("influence"))
@@ -117,6 +119,8 @@ public class PrepareTest {
 					.filter(r -> r.getId().equals(doi1))
 					.collect()
 					.get(0)
+							.getInstance()
+							.get(0)
 					.getMeasures()
 					.stream()
 					.filter(sl -> sl.getId().equals("popularity_alt"))
@@ -131,6 +135,8 @@ public class PrepareTest {
 					.filter(r -> r.getId().equals(doi1))
 					.collect()
 					.get(0)
+							.getInstance()
+							.get(0)
 					.getMeasures()
 					.stream()
 					.filter(sl -> sl.getId().equals("popularity"))
diff --git a/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/ProduceTest.java b/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/ProduceTest.java
index b77b5bb36..4522cbf07 100644
--- a/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/ProduceTest.java
+++ b/dhp-workflows/dhp-aggregation/src/test/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/ProduceTest.java
@@ -126,6 +126,7 @@ public class ProduceTest {
 					.filter(row -> row.getId().equals("unresolved::10.3390/s18072310::doi"))
 					.collect()
 					.get(0)
+							.getInstance().get(0)
 					.getMeasures()
 					.size());
 
@@ -179,7 +180,8 @@ public class ProduceTest {
 
 		List<Measure> measures = tmp
 			.filter(row -> row.getId().equals("unresolved::10.3390/s18072310::doi"))
-			.flatMap(row -> row.getMeasures().iterator())
+			.flatMap(row -> row.getInstance().iterator())
+				.flatMap(inst -> inst.getMeasures().iterator())
 			.collect();
 		Assertions
 			.assertEquals(
@@ -226,7 +228,7 @@ public class ProduceTest {
 				85,
 				tmp
 					.filter(row -> !row.getId().equals("unresolved::10.3390/s18072310::doi"))
-					.filter(r -> r.getMeasures() != null)
+					.filter(r -> r.getInstance() != null)
 					.count());
 
 	}