diff --git a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/migration/step2/AbstractMdRecordToOafMapper.java b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/migration/step2/AbstractMdRecordToOafMapper.java
index 7c3000fba..18a62124b 100644
--- a/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/migration/step2/AbstractMdRecordToOafMapper.java
+++ b/dhp-workflows/dhp-aggregation/src/main/java/eu/dnetlib/dhp/migration/step2/AbstractMdRecordToOafMapper.java
@@ -69,7 +69,7 @@ public abstract class AbstractMdRecordToOafMapper {
 			nsContext.put("datacite", "http://datacite.org/schema/kernel-3");
 			DocumentFactory.getInstance().setXPathNamespaceURIs(nsContext);
 
-			final Document doc = DocumentHelper.parseText(xml);
+			final Document doc = DocumentHelper.parseText(xml.replaceAll("http://datacite.org/schema/kernel-4", "http://datacite.org/schema/kernel-3"));
 
 			final String type = doc.valueOf("//dr:CobjCategory/@type");
 			final KeyValue collectedFrom = keyValue(doc.valueOf("//oaf:collectedFrom/@id"), doc.valueOf("//oaf:collectedFrom/@name"));