diff --git a/ems-core/src/main/java/it/integry/ems_model/utility/UtilityString.java b/ems-core/src/main/java/it/integry/ems_model/utility/UtilityString.java
index f6b5320595..2527d4e591 100644
--- a/ems-core/src/main/java/it/integry/ems_model/utility/UtilityString.java
+++ b/ems-core/src/main/java/it/integry/ems_model/utility/UtilityString.java
@@ -20,7 +20,6 @@ import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-@SuppressWarnings("serial")
 public class UtilityString {
 
     //private static final Logger logger = LogManager.getLogger();
@@ -487,6 +486,10 @@ public class UtilityString {
         return emptyStr2Null(s);
     }
 
+    public static String emsNullIfBlank(String s) {
+        return nullIfBlank(s) == null ? EmsRestConstants.NULL : s;
+    }
+
     public static int toExcelColumnIndex(String columnName) {
         columnName = columnName.toUpperCase();
         int value = 0;
diff --git a/ems-engine/src/main/java/it/integry/ems/retail/wms/generic/dto/articolo/ArticoloDTO.java b/ems-engine/src/main/java/it/integry/ems/retail/wms/generic/dto/articolo/ArticoloDTO.java
index cd8fb50bd1..8a5b69d739 100644
--- a/ems-engine/src/main/java/it/integry/ems/retail/wms/generic/dto/articolo/ArticoloDTO.java
+++ b/ems-engine/src/main/java/it/integry/ems/retail/wms/generic/dto/articolo/ArticoloDTO.java
@@ -1,7 +1,10 @@
 package it.integry.ems.retail.wms.generic.dto.articolo;
 
+import it.integry.common.var.CommonConstants;
 import it.integry.ems_model.annotation.SqlField;
+import it.integry.ems_model.config.EmsRestConstants;
 import it.integry.ems_model.entity.MtbAart;
+import it.integry.ems_model.utility.UtilityString;
 
 import java.math.BigDecimal;
 
@@ -284,26 +287,26 @@ public class ArticoloDTO {
         return this;
     }
 
-    public MtbAart toMtbAart(){
+    public MtbAart toMtbAart() {
         MtbAart articolo = new MtbAart();
         articolo
                 .setCodMart(codMart)
                 .setDescrizione(descrizione)
                 .setUntMis(untMis)
-                .setBarCode(barcode)
+                .setBarCode(UtilityString.emsNullIfBlank(barcode))
                 .setQtaCnf(qtaCnf)
                 .setCodAliq(codAliq)
                 .setArticoloComposto(articoloComposto)
                 .setDescrizioneEstesa(descrizioneEstesa)
                 .setNote(note)
-                .setPosizione(posizione)
+                .setPosizione(UtilityString.emsNullIfBlank(posizione))
                 .setCodMgrp(codMgrp)
                 .setCodMsfa(codMsfa)
                 .setCodMsgr(codMsgr)
                 .setCodMstp(codMstp)
                 .setCodMtip(codMtip)
                 .setFlagStato(flagStato ? "A" : "I")
-                .setCodBarreImb(barcodeImballo)
+                .setCodBarreImb(UtilityString.emsNullIfBlank(barcodeImballo))
                 .setDiacod(diacod)
                 .setFlagQtaCnfFissa(flagQtaCnfFissa ? "S" : "N")
                 .setIdArtEqui(idArtEqui)