diff --git a/dhp-workflows/dhp-blacklist/src/main/java/eu/dnetlib/dhp/blacklist/ReadBlacklistFromDB.java b/dhp-workflows/dhp-blacklist/src/main/java/eu/dnetlib/dhp/blacklist/ReadBlacklistFromDB.java
index 7d0d6b0b8..380991526 100644
--- a/dhp-workflows/dhp-blacklist/src/main/java/eu/dnetlib/dhp/blacklist/ReadBlacklistFromDB.java
+++ b/dhp-workflows/dhp-blacklist/src/main/java/eu/dnetlib/dhp/blacklist/ReadBlacklistFromDB.java
@@ -90,7 +90,7 @@ public class ReadBlacklistFromDB implements Closeable {
 			inverse.setSource(target_direct);
 
 			String encoding = rs.getString("relationship");
-			RelationInverse ri = ModelSupport.relationInverseMap.get(encoding);
+			RelationInverse ri = ModelSupport.findInverse(encoding);
 			direct.setRelClass(ri.getRelClass());
 			inverse.setRelClass(ri.getInverseRelClass());
 			direct.setRelType(ri.getRelType());
diff --git a/dhp-workflows/dhp-blacklist/src/test/java/eu/dnetlib/dhp/blacklist/BlacklistRelationTest.java b/dhp-workflows/dhp-blacklist/src/test/java/eu/dnetlib/dhp/blacklist/BlacklistRelationTest.java
new file mode 100644
index 000000000..160658e5b
--- /dev/null
+++ b/dhp-workflows/dhp-blacklist/src/test/java/eu/dnetlib/dhp/blacklist/BlacklistRelationTest.java
@@ -0,0 +1,38 @@
+
+package eu.dnetlib.dhp.blacklist;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import eu.dnetlib.dhp.schema.common.ModelSupport;
+import eu.dnetlib.dhp.schema.common.RelationInverse;
+
+public class BlacklistRelationTest {
+
+	@Test
+	public void testRelationInverseLookup() {
+
+		final List<String> rels = Arrays
+			.asList(
+				"resultResult_relationship_IsRelatedTo",
+				"resultOrganization_affiliation_isAuthorInstitutionOf",
+				"resultOrganization_affiliation_hasAuthorInstitution",
+				"datasourceOrganization_provision_isProvidedBy",
+				"projectOrganization_participation_hasParticipant",
+				"resultProject_outcome_produces",
+				"resultProject_outcome_isProducedBy");
+
+		rels.forEach(r -> {
+			RelationInverse inverse = ModelSupport.relationInverseMap.get(r);
+			Assertions.assertNotNull(inverse);
+			Assertions.assertNotNull(inverse.getRelType());
+			Assertions.assertNotNull(inverse.getSubReltype());
+			Assertions.assertNotNull(inverse.getRelClass());
+		});
+
+	}
+
+}