diff --git a/gxweb/src/main/java/com/genexus/internet/HttpAjaxContext.java b/gxweb/src/main/java/com/genexus/internet/HttpAjaxContext.java
index e534dcb36..2af59c06c 100644
--- a/gxweb/src/main/java/com/genexus/internet/HttpAjaxContext.java
+++ b/gxweb/src/main/java/com/genexus/internet/HttpAjaxContext.java
@@ -746,7 +746,7 @@ private boolean checkFileExists(String fileName)
 		boolean fileExists = false;
 		try
 		{
-			fileExists = ApplicationContext.getInstance().checkIfResourceExist(getDefaultPath() + staticContentBase + fileName);			
+			fileExists = ApplicationContext.getInstance().checkIfResourceExist(getDefaultPath() + staticContentBase + fileName);
 		}
 		catch (Exception e)
 		{
@@ -886,18 +886,22 @@ public void ajax_rsp_assign_sdt_attri( String CmpContext, boolean IsMasterPage,
                 {
                   try {
 					  JSONObjectWrapper obj = getGxObject(AttValues, CmpContext, IsMasterPage);
-					  if (obj != null && (!isUndefinedOutParam( AttName, SdtObj) || dynAjaxEventContext.isParmModified(AttName, SdtObj)))
-					  {
-                        if (SdtObj instanceof IGxJSONAble)
-                            obj.put(AttName, ((IGxJSONAble)SdtObj).GetJSONObject());
-                        else
-                        {
-                            if (SdtObj.getClass().isArray())
-                            {
-                                obj.put(AttName, ObjArrayToJSONArray(SdtObj));
-                            }
-                        }
-                      }
+					  if (obj != null) {
+						  if (SdtObj instanceof com.genexus.util.GXHashMap) {
+							  obj.put(AttName, ((com.genexus.util.jsonsableHash) SdtObj).toJson());
+						  }
+						  else {
+							  if ((!isUndefinedOutParam(AttName, SdtObj) || dynAjaxEventContext.isParmModified(AttName, SdtObj))) {
+								  if (SdtObj instanceof IGxJSONAble)
+									  obj.put(AttName, ((IGxJSONAble) SdtObj).GetJSONObject());
+								  else {
+									  if (SdtObj.getClass().isArray()) {
+										  obj.put(AttName, ObjArrayToJSONArray(SdtObj));
+									  }
+								  }
+							  }
+						  }
+					  }
                   }
                   catch (JSONException e) {
 					  logger.error(String.format("Could not serialize Object '%s' to JSON", AttName), e);
diff --git a/gxweb/src/main/java/com/genexus/webpanels/GXWebPanel.java b/gxweb/src/main/java/com/genexus/webpanels/GXWebPanel.java
index 80c6db315..581c7499d 100644
--- a/gxweb/src/main/java/com/genexus/webpanels/GXWebPanel.java
+++ b/gxweb/src/main/java/com/genexus/webpanels/GXWebPanel.java
@@ -770,47 +770,41 @@ private void SetFieldValue(Object targetObj, String fieldName, Object value) thr
 			if (field != null)
             {
 				Class fieldType = field.getType();
-				if (IGxJSONSerializable.class.isAssignableFrom(field.getType()))
-				{
-					Class[] cArg = new Class[1];
-					cArg[0] = String.class;
-					Object fieldInstance = PrivateUtilities.getFieldValue(targetObj, fieldName);
-					Method mth;
-					if (value instanceof JSONArray || value instanceof JSONObjectWrapper)
-					{
-						mth = field.getType().getMethod("FromJSONObject", new Class[]{Object.class});
-						mth.invoke(fieldInstance , new Object[]{value});
-					}
-					else
-					{
-						mth = field.getType().getMethod("fromJSonString", cArg);
-						mth.invoke(fieldInstance , new Object[]{value.toString()});
-					}
-
-					PrivateUtilities.setFieldValue(targetObj, field.getName(), fieldInstance);
+				Object fieldInstance = PrivateUtilities.getFieldValue(targetObj, fieldName);
+				Method mth;
+				if (com.genexus.util.GXHashMap.class.isAssignableFrom(field.getType())) {
+					mth = field.getType().getMethod("fromJson", new Class[]{Object.class});
+					mth.invoke(fieldInstance, new Object[]{value});
 				}
-				else
-				{
-					try
-					{
-						if (fieldType.isArray())
-						{
-							Object tempArray = getArrayFieldValue(fieldType, value);
-							if (tempArray != null)
-							{
-								value = tempArray;
-							}
+				else {
+					if (IGxJSONSerializable.class.isAssignableFrom(field.getType())) {
+						Class[] cArg = new Class[1];
+						cArg[0] = String.class;
+						if (value instanceof JSONArray || value instanceof JSONObjectWrapper) {
+							mth = field.getType().getMethod("FromJSONObject", new Class[]{Object.class});
+							mth.invoke(fieldInstance, new Object[]{value});
+						} else {
+							mth = field.getType().getMethod("fromJSonString", cArg);
+							mth.invoke(fieldInstance, new Object[]{value.toString()});
 						}
-						else {
-							if (fieldType == java.util.Date.class)
-								value = localUtil.ctot(value.toString(), 0);
-							else
-								value = GXutil.convertObjectTo(value, fieldType);
+
+						PrivateUtilities.setFieldValue(targetObj, field.getName(), fieldInstance);
+					} else {
+						try {
+							if (fieldType.isArray()) {
+								Object tempArray = getArrayFieldValue(fieldType, value);
+								if (tempArray != null) {
+									value = tempArray;
+								}
+							} else {
+								if (fieldType == java.util.Date.class)
+									value = localUtil.ctot(value.toString(), 0);
+								else
+									value = GXutil.convertObjectTo(value, fieldType);
+							}
+							PrivateUtilities.setFieldValue(targetObj, field.getName(), value);
+						} catch (Exception e) {
 						}
-						PrivateUtilities.setFieldValue(targetObj, field.getName(), value);
-					}
-					catch (Exception e)
-					{
 					}
 				}
 			}
diff --git a/java/src/main/java/com/genexus/util/jsonsableHash.java b/java/src/main/java/com/genexus/util/jsonsableHash.java
new file mode 100644
index 000000000..3c8348573
--- /dev/null
+++ b/java/src/main/java/com/genexus/util/jsonsableHash.java
@@ -0,0 +1,6 @@
+package com.genexus.util;
+
+public interface jsonsableHash {
+	public String toJson();
+	public void fromJson(String json);
+}