diff --git a/base/src/org/compiere/model/CalloutEngine.java b/base/src/org/compiere/model/CalloutEngine.java
index c8828a5e85..0cbe25295a 100644
--- a/base/src/org/compiere/model/CalloutEngine.java
+++ b/base/src/org/compiere/model/CalloutEngine.java
@@ -165,24 +165,26 @@ public class CalloutEngine implements Callout
 
 	/*************************************************************************/
 	
-	private static boolean s_calloutActive = false;
+	//private static boolean s_calloutActive = false;
 	
 	/**
 	 * 	Is Callout Active
+	 *  @deprecated
 	 *	@return true if active
 	 */
 	protected static boolean isCalloutActive()
 	{
-		return s_calloutActive;
+		return false;
 	}	//	isCalloutActive
 
 	/**
 	 * 	Set Callout (in)active
+	 *  @deprecated
 	 *	@param active active
 	 */
 	protected static void setCalloutActive (boolean active)
 	{
-		s_calloutActive = active;
+		; //no op
 	}	//	setCalloutActive
 	
 	/**
diff --git a/base/src/org/compiere/model/GridTab.java b/base/src/org/compiere/model/GridTab.java
index 03a09dfffe..66154c22f3 100644
--- a/base/src/org/compiere/model/GridTab.java
+++ b/base/src/org/compiere/model/GridTab.java
@@ -2349,6 +2349,18 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
 		}   //  for all dependent fields
 	}   //  processDependencies
 
+	
+	private List<String> activeCallouts = new ArrayList<String>();
+	
+	/**
+	 * 
+	 * @return list of active call out for this tab
+	 */
+	public String[] getActiveCallouts()
+	{
+		String[] list = new String[activeCallouts.size()];
+		return activeCallouts.toArray(list);
+	}
 
 	/**************************************************************************
 	 *  Process Callout(s).
@@ -2365,7 +2377,7 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
 	 * @return error message or ""
 	 * @see org.compiere.model.Callout
 	 */
-	private String processCallout (GridField field)
+	public String processCallout (GridField field)
 	{
 		String callout = field.getCallout();
 		if (callout.length() == 0)
@@ -2383,6 +2395,10 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
 		while (st.hasMoreTokens())      //  for each callout
 		{
 			String cmd = st.nextToken().trim();
+			
+			//detect infinite loop
+			if (activeCallouts.contains(cmd)) continue;
+			
 			Callout call = null;
 			String method = null;
 			int methodStart = cmd.lastIndexOf('.');
@@ -2407,6 +2423,7 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
 			String retValue = "";
 			try
 			{
+				activeCallouts.add(cmd);
 				retValue = call.start(m_vo.ctx, method, m_vo.WindowNo, this, field, value, oldValue);
 			}
 			catch (Exception e)
@@ -2414,7 +2431,12 @@ public class GridTab implements DataStatusListener, Evaluatee, Serializable
 				log.log(Level.SEVERE, "start", e);
 				retValue = 	"Callout Invalid: " + e.toString();
 				return retValue;
+			} 
+			finally
+			{
+				activeCallouts.remove(cmd);
 			}
+			
 			if (!retValue.equals(""))		//	interrupt on first error
 			{
 				log.severe (retValue);