diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java
index 842638f40..16fde4517 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OdfToOafMapper.java
@@ -348,7 +348,7 @@ public class OdfToOafMapper extends AbstractMdRecordToOafMapper {
 							getRelation(
 								otherId, docId, RESULT_RESULT, SUPPLEMENT, IS_SUPPLEMENTED_BY, collectedFrom, info,
 								lastUpdateTimestamp));
-				} else if (type.equals("IsPartOf")) {
+				} else if (type.equalsIgnoreCase("IsPartOf")) {
 
 					res
 						.add(