From a42d572902246dd3e9182dbbedcc136a6a077e35 Mon Sep 17 00:00:00 2001
From: Heng Sin Low <hengsin@gmail.com>
Date: Fri, 27 Mar 2009 09:00:51 +0000
Subject: [PATCH] 
 https://sourceforge.net/tracker/?func=detail&atid=879332&aid=2716555&group_id=176962

---
 .../webui/panel/AbstractADWindowPanel.java    | 21 +++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/zkwebui/WEB-INF/src/org/adempiere/webui/panel/AbstractADWindowPanel.java b/zkwebui/WEB-INF/src/org/adempiere/webui/panel/AbstractADWindowPanel.java
index ca397f374f..54a00d0be7 100644
--- a/zkwebui/WEB-INF/src/org/adempiere/webui/panel/AbstractADWindowPanel.java
+++ b/zkwebui/WEB-INF/src/org/adempiere/webui/panel/AbstractADWindowPanel.java
@@ -791,8 +791,6 @@ public abstract class AbstractADWindowPanel extends AbstractUIPart implements To
 		    return false;
 		}
 
-		back = (newTabIndex < oldTabIndex);
-
 		IADTabpanel oldTabpanel = curTabpanel;
 		IADTabpanel newTabpanel = adTab.getSelectedTabpanel();
 		curTab = newTabpanel.getGridTab();
@@ -801,6 +799,25 @@ public abstract class AbstractADWindowPanel extends AbstractUIPart implements To
 			oldTabpanel.activate(false);
 		newTabpanel.activate(true);
 
+		back = (newTabIndex < oldTabIndex);
+		if (back)
+		{
+			if (newTabpanel.getTabLevel() >= oldTabpanel.getTabLevel())
+				back = false;
+			else if ((newTabIndex - oldTabIndex) > 1)
+			{
+				for (int i = oldTabIndex - 1; i > newTabIndex; i--)
+				{
+					IADTabpanel next = adTab.getADTabpanel(i);
+					if (next != null && next.getTabLevel() <= newTabpanel.getTabLevel())
+					{
+						back = false;
+						break;
+					}
+				}
+			}
+		}
+		
 		if (!back)
 		{
 		    newTabpanel.query();