diff --git a/migration/i7.1/oracle/202001211400_IDEMPIERE-4152.sql b/migration/i7.1/oracle/202001211400_IDEMPIERE-4152.sql
new file mode 100644
index 0000000000..011c70da8a
--- /dev/null
+++ b/migration/i7.1/oracle/202001211400_IDEMPIERE-4152.sql
@@ -0,0 +1,10 @@
+SET SQLBLANKLINES ON
+SET DEFINE OFF
+
+-- IDEMPIERE-4152 - Payment Allocation : notify user when date changes
+-- 2020-01-21 02:03:32
+INSERT INTO AD_Message (MsgType,MsgText,AD_Client_ID,AD_Org_ID,IsActive,Created,CreatedBy,Updated,UpdatedBy,AD_Message_ID,Value,EntityType,AD_Message_UU) VALUES ('I','Allocation date updated',0,0,'Y',TO_DATE('2020-01-21 14:03:32','YYYY-MM-DD HH24:MI:SS'),100,TO_DATE('2020-01-21 14:03:32','YYYY-MM-DD HH24:MI:SS'),100,200592,'AllocationDateUpdated','D','c5cb7231-9ccc-4219-aaab-46ac3de8a372')
+;
+
+SELECT register_migration_script('202001211400_IDEMPIERE-4152.sql') FROM dual
+;
diff --git a/migration/i7.1/postgresql/202001211400_IDEMPIERE-4152.sql b/migration/i7.1/postgresql/202001211400_IDEMPIERE-4152.sql
new file mode 100644
index 0000000000..de424f46ef
--- /dev/null
+++ b/migration/i7.1/postgresql/202001211400_IDEMPIERE-4152.sql
@@ -0,0 +1,7 @@
+-- IDEMPIERE-4152 - Payment Allocation : notify user when date changes
+-- 2020-01-21 02:03:32
+INSERT INTO AD_Message (MsgType,MsgText,AD_Client_ID,AD_Org_ID,IsActive,Created,CreatedBy,Updated,UpdatedBy,AD_Message_ID,Value,EntityType,AD_Message_UU) VALUES ('I','Allocation date updated',0,0,'Y',TO_TIMESTAMP('2020-01-21 14:03:32','YYYY-MM-DD HH24:MI:SS'),100,TO_TIMESTAMP('2020-01-21 14:03:32','YYYY-MM-DD HH24:MI:SS'),100,200592,'AllocationDateUpdated','D','c5cb7231-9ccc-4219-aaab-46ac3de8a372')
+;
+
+SELECT register_migration_script('202001211400_IDEMPIERE-4152.sql') FROM dual
+;
diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/form/WAllocation.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/form/WAllocation.java
index 7adcedeca7..42a8a6afcd 100755
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/form/WAllocation.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/apps/form/WAllocation.java
@@ -66,6 +66,7 @@ import org.compiere.util.TrxRunnable;
 import org.compiere.util.Util;
 import org.zkoss.zk.ui.event.Event;
 import org.zkoss.zk.ui.event.EventListener;
+import org.zkoss.zk.ui.util.Clients;
 import org.zkoss.zul.Borderlayout;
 import org.zkoss.zul.Center;
 import org.zkoss.zul.Div;
@@ -703,10 +704,15 @@ public class WAllocation extends Allocation
 		
 		paymentInfo.setText(calculatePayment(paymentTable, multiCurrency.isSelected()));
 		invoiceInfo.setText(calculateInvoice(invoiceTable, multiCurrency.isSelected()));
-		
+
 		//	Set AllocationDate
-		if (allocDate != null)
-			dateField.setValue(allocDate);
+		if (allocDate != null) {
+			if (! allocDate.equals(dateField.getValue())) {
+                Clients.showNotification(Msg.getMsg(Env.getCtx(), "AllocationDateUpdated"), Clients.NOTIFICATION_TYPE_INFO, dateField.getComponent(), "start_before", -1, true);       
+                dateField.setValue(allocDate);
+			}
+		}
+
 		//  Set Allocation Currency
 		allocCurrencyLabel.setText(currencyPick.getDisplay());
 		//  Difference