diff --git a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/Constants.java b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/Constants.java
index 47a2359105..b86adb27e4 100644
--- a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/Constants.java
+++ b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/Constants.java
@@ -15,8 +15,6 @@ import eu.dnetlib.dhp.application.ArgumentApplicationParser;
 
 public class Constants {
 
-	public static final String UNREOSLVED_PREFIX = "unresolved:";
-	public static final String UNREOSLVED_POSTFIX_DOI = ":doi";
 	public static final String DOI = "doi";
 
 	public static final String UPDATE_DATA_INFO_TYPE = "update";
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 40d420ec4c..b1f6710314 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
@@ -94,7 +94,7 @@ public class PrepareBipFinder implements Serializable {
 			.map((MapFunction<BipScore, Result>) v -> {
 				Result r = new Result();
 
-				r.setId(DHPUtils.generateUnresolvedIdentifier(v.getId(), "doi"));
+				r.setId(DHPUtils.generateUnresolvedIdentifier(v.getId(), DOI));
 				r.setMeasures(getMeasure(v));
 				return r;
 			}, Encoders.bean(Result.class))
diff --git a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareFOSSparkJob.java b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareFOSSparkJob.java
index d77fb38bc7..17631e3962 100644
--- a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareFOSSparkJob.java
+++ b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/actionmanager/createunresolvedentities/PrepareFOSSparkJob.java
@@ -79,7 +79,7 @@ public class PrepareFOSSparkJob implements Serializable {
 		}, Encoders.bean(FOSDataModel.class))
 			.map((MapFunction<FOSDataModel, Result>) value -> {
 				Result r = new Result();
-				r.setId(DHPUtils.generateUnresolvedIdentifier(value.getDoi(), "doi"));
+				r.setId(DHPUtils.generateUnresolvedIdentifier(value.getDoi(), DOI));
 				r.setSubject(getSubjects(value));
 				return r;
 			}, Encoders.bean(Result.class))