diff --git a/base/src/org/compiere/model/ModelValidationEngine.java b/base/src/org/compiere/model/ModelValidationEngine.java
index 17f96a008c..db72bc39dc 100644
--- a/base/src/org/compiere/model/ModelValidationEngine.java
+++ b/base/src/org/compiere/model/ModelValidationEngine.java
@@ -22,6 +22,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Properties;
 import java.util.StringTokenizer;
+import java.util.logging.Level;
 
 import javax.script.ScriptEngine;
 
@@ -386,11 +387,19 @@ public class ModelValidationEngine
 				{
 					String error = validator.modelChange(po, changeType);
 					if (error != null && error.length() > 0)
+					{
+						if (log.isLoggable(Level.FINE))
+						{
+							log.log(Level.FINE, "po="+po+" validator="+validator+" changeType="+changeType);
+						}
 						return error;
+					}
 				}
 			}
 			catch (Exception e)
 			{
+				//log the exception
+				log.log(Level.SEVERE, e.getLocalizedMessage(), e);
 				String error = e.getLocalizedMessage();
 				if (error == null)
 					error = e.toString();
@@ -533,13 +542,20 @@ public class ModelValidationEngine
 				{
 					String error = validator.docValidate(po, docTiming);
 					if (error != null && error.length() > 0)
+					{
+						if (log.isLoggable(Level.FINE))
+						{
+							log.log(Level.FINE, "po="+po+" validator="+validator+" timing="+docTiming);
+						}
 						return error;
+					}
 				}
 			}
 			catch (Exception e)
 			{
+				//log the stack trace
+				log.log(Level.SEVERE, e.getLocalizedMessage(), e);
 				// Exeptions are errors and should stop the document processing - teo_sarca [ 1679692 ]
-				// log.log(Level.SEVERE, validator.toString(), e);
 				String error = e.getLocalizedMessage();
 				if (error == null)
 					error = e.toString();
@@ -666,13 +682,20 @@ public class ModelValidationEngine
 				{
 					String error = validator.factsValidate(schema, facts, po);
 					if (error != null && error.length() > 0)
+					{
+						if (log.isLoggable(Level.FINE))
+						{
+							log.log(Level.FINE, "po="+po+" schema="+schema+" validator="+validator);
+						}
 						return error;
+					}
 				}
 			}
 			catch (Exception e)
 			{
-				// Exeptions are errors and should stop the document processing - teo_sarca [ 1679692 ]
-				// log.log(Level.SEVERE, validator.toString(), e);
+				//log the stack trace
+				log.log(Level.SEVERE, e.getLocalizedMessage(), e);
+				// Exeptions are errors and should stop the document processing - teo_sarca [ 1679692 ]				
 				String error = e.getLocalizedMessage();
 				if (error == null)
 					error = e.toString();
diff --git a/base/src/org/compiere/wf/MWFActivity.java b/base/src/org/compiere/wf/MWFActivity.java
index 9a193eb6a7..a0c3869a6d 100644
--- a/base/src/org/compiere/wf/MWFActivity.java
+++ b/base/src/org/compiere/wf/MWFActivity.java
@@ -542,17 +542,25 @@ public class MWFActivity extends X_AD_WF_Activity implements Runnable
 		if (obj == null)
 			return;
 		//
-		StringBuffer TextMsg = new StringBuffer (obj.toString());
+		StringBuffer TextMsg = new StringBuffer ();
 		if (obj instanceof Exception)
 		{
 			Exception ex = (Exception)obj;
+			if (ex.getMessage() != null && ex.getMessage().trim().length() > 0)
+			{
+				TextMsg.append(ex.toString());
+			}
+			else if (ex instanceof NullPointerException)
+			{
+				TextMsg.append(ex.getClass().getName());
+			}
 			while (ex != null)
 			{
 				StackTraceElement[] st = ex.getStackTrace();
 				for (int i = 0; i < st.length; i++)
 				{
 					StackTraceElement ste = st[i];
-					if (i == 0 || ste.getClassName().startsWith("org.compiere"))
+					if (i == 0 || ste.getClassName().startsWith("org.compiere") || ste.getClassName().startsWith("org.adempiere"))
 						TextMsg.append(" (").append(i).append("): ")
 							.append(ste.toString())
 							.append("\n");
@@ -563,6 +571,10 @@ public class MWFActivity extends X_AD_WF_Activity implements Runnable
 					ex = null;
 			}
 		}
+		else
+		{
+			TextMsg.append(obj.toString());
+		}
 		//
 		String oldText = getTextMsg();
 		if (oldText == null || oldText.length() == 0)
@@ -759,6 +771,7 @@ public class MWFActivity extends X_AD_WF_Activity implements Runnable
 			if (!m_state.isValidAction(StateEngine.ACTION_Start))
 			{
 				setTextMsg("State=" + getWFState() + " - cannot start");
+				addTextMsg(new Exception(""));
 				setWFState(StateEngine.STATE_Terminated);
 				return;
 			}
@@ -1283,6 +1296,7 @@ public class MWFActivity extends X_AD_WF_Activity implements Runnable
 			{
 				newState = StateEngine.STATE_Terminated;
 				setTextMsg ("User Choice: " + e.toString());
+				addTextMsg(e);
 				log.log(Level.WARNING, "", e);
 			}
 			// Send Approval Notification
diff --git a/base/src/org/compiere/wf/MWFProcess.java b/base/src/org/compiere/wf/MWFProcess.java
index 0cb32ab61d..f867f8cf28 100644
--- a/base/src/org/compiere/wf/MWFProcess.java
+++ b/base/src/org/compiere/wf/MWFProcess.java
@@ -33,6 +33,7 @@ import org.compiere.process.StateEngine;
 import org.compiere.util.DB;
 import org.compiere.util.Env;
 import org.compiere.util.TimeUtil;
+import org.compiere.util.Util;
 
 
 /**
@@ -110,6 +111,7 @@ public class MWFProcess extends X_AD_WF_Process
 		if (getPO() == null)
 		{
 			setTextMsg("No PO with ID=" + pi.getRecord_ID());
+			addTextMsg(new Exception(""));
 			super.setWFState (WFSTATE_Terminated);
 		}
 		else
@@ -310,6 +312,7 @@ public class MWFProcess extends X_AD_WF_Process
 		if (activities.length == 0)
 		{
 			setTextMsg("No Active Processed found");
+			addTextMsg(new Exception(""));
 			closedState = WFSTATE_Terminated;
 		}
 		if (closedState != null)
@@ -503,6 +506,7 @@ public class MWFProcess extends X_AD_WF_Process
 		{
 			log.log(Level.SEVERE, "AD_WF_Node_ID=" + AD_WF_Node_ID, e);
 			setTextMsg(e.toString());
+			addTextMsg(e);
 			setWFState(StateEngine.STATE_Terminated);
 			return false;
 		}
@@ -549,7 +553,56 @@ public class MWFProcess extends X_AD_WF_Process
 			super.setTextMsg (oldText + "\n - " + TextMsg);
 	}	//	setTextMsg	
 
-
+	/**
+	 * 	Add to Text Msg
+	 *	@param obj some object
+	 */
+	public void addTextMsg (Object obj)
+	{
+		if (obj == null)
+			return;
+		//
+		StringBuffer TextMsg = new StringBuffer ();
+		if (obj instanceof Exception)
+		{
+			Exception ex = (Exception)obj;
+			if (ex.getMessage() != null && ex.getMessage().trim().length() > 0)
+			{
+				TextMsg.append(ex.toString());
+			}
+			else if (ex instanceof NullPointerException)
+			{
+				TextMsg.append(ex.getClass().getName());
+			}
+			while (ex != null)
+			{
+				StackTraceElement[] st = ex.getStackTrace();
+				for (int i = 0; i < st.length; i++)
+				{
+					StackTraceElement ste = st[i];
+					if (i == 0 || ste.getClassName().startsWith("org.compiere") || ste.getClassName().startsWith("org.adempiere"))
+						TextMsg.append(" (").append(i).append("): ")
+							.append(ste.toString())
+							.append("\n");
+				}
+				if (ex.getCause() instanceof Exception)
+					ex = (Exception)ex.getCause();
+				else
+					ex = null;
+			}
+		}
+		else
+		{
+			TextMsg.append(obj.toString());
+		}
+		//
+		String oldText = getTextMsg();
+		if (oldText == null || oldText.length() == 0)
+			super.setTextMsg(Util.trimSize(TextMsg.toString(),1000));
+		else if (TextMsg != null && TextMsg.length() > 0)
+			super.setTextMsg(Util.trimSize(oldText + "\n - " + TextMsg.toString(),1000));
+	}	//	addTextMsg
+	
 	/**
 	 * 	Set Runtime (Error) Message
 	 *	@param msg message