diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/funderresults/SparkResultLinkedToProject.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/funderresults/SparkResultLinkedToProject.java
index e5d7e2254..8c91fbf1f 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/funderresults/SparkResultLinkedToProject.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/funderresults/SparkResultLinkedToProject.java
@@ -6,9 +6,9 @@ import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;
 import java.io.Serializable;
 import java.util.Optional;
 
+import eu.dnetlib.dhp.oa.graph.dump.Constants;
 import org.apache.commons.io.IOUtils;
 import org.apache.spark.SparkConf;
-import org.apache.spark.api.java.function.FilterFunction;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.api.java.function.MapGroupsFunction;
 import org.apache.spark.sql.Dataset;
@@ -64,19 +64,19 @@ public class SparkResultLinkedToProject implements Serializable {
 			isSparkSessionManaged,
 			spark -> {
 				Utils.removeOutputDir(spark, outputPath);
-				writeResultsLikedToProjects(spark, inputClazz, inputPath, outputPath, relationPath);
+				writeResultsLinkedToProjects(spark, inputClazz, inputPath, outputPath, relationPath);
 			});
 	}
 
-	private static <R extends Result> void writeResultsLikedToProjects(SparkSession spark, Class<R> inputClazz,
-		String inputPath, String outputPath, String relationPath) {
+	private static <R extends Result> void writeResultsLinkedToProjects(SparkSession spark, Class<R> inputClazz,
+																		String inputPath, String outputPath, String relationPath) {
 
 		Dataset<R> results = Utils
 			.readPath(spark, inputPath, inputClazz)
 			.filter("dataInfo.deletedbyinference = false and datainfo.invisible = false");
 		Dataset<Relation> relations = Utils
 			.readPath(spark, relationPath, Relation.class)
-			.filter("dataInfo.deletedbyinference = false and lower(relClass) = 'isproducedby'");
+			.filter("dataInfo.deletedbyinference = false and lower(relClass) = '" + Constants.RESULT_PROJECT_IS_PRODUCED_BY.toLowerCase() + "'");
 
 		relations
 			.joinWith(