diff --git a/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/OafMapperUtils.java b/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/OafMapperUtils.java
index 20f8e7ba0..5d6e7565d 100644
--- a/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/OafMapperUtils.java
+++ b/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/OafMapperUtils.java
@@ -43,13 +43,13 @@ public class OafMapperUtils {
 		return left;
 	}
 
-	public static Result mergeResults(Result r1, Result r2) {
-		if (new ResultTypeComparator().compare(r1, r2) < 0) {
-			r1.mergeFrom(r2);
-			return r1;
+	public static Result mergeResults(Result left, Result right) {
+		if (new ResultTypeComparator().compare(left, right) < 0) {
+			left.mergeFrom(right);
+			return left;
 		} else {
-			r2.mergeFrom(r1);
-			return r2;
+			right.mergeFrom(left);
+			return right;
 		}
 	}
 
diff --git a/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/DatePicker.java b/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/DatePicker.java
index c2fe09a4d..688948728 100644
--- a/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/DatePicker.java
+++ b/dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/DatePicker.java
@@ -18,7 +18,7 @@ import eu.dnetlib.dhp.schema.oaf.Field;
 
 public class DatePicker {
 
-	public static final String DATE_PATTERN = "\\d{4}-\\d{2}-\\d{2}";
+	public static final String DATE_PATTERN = "^\\d{4}-\\d{2}-\\d{2}$";
 	private static final String DATE_DEFAULT_SUFFIX = "01-01";
 	private static final int YEAR_LB = 1300;
 	private static final int YEAR_UB = Year.now().getValue() + 5;