diff --git a/base/src/org/compiere/model/I_AD_System.java b/base/src/org/compiere/model/I_AD_System.java
index a5d007546b..15effb8ff8 100644
--- a/base/src/org/compiere/model/I_AD_System.java
+++ b/base/src/org/compiere/model/I_AD_System.java
@@ -200,6 +200,15 @@ public interface I_AD_System
 	  */
 	public boolean isAutoErrorReport();
 
+    /** Column name IsFailOnMissingModelValidator */
+    public static final String COLUMNNAME_IsFailOnMissingModelValidator = "IsFailOnMissingModelValidator";
+
+	/** Set Fail on Missing Model Validator	  */
+	public void setIsFailOnMissingModelValidator (boolean IsFailOnMissingModelValidator);
+
+	/** Get Fail on Missing Model Validator	  */
+	public boolean isFailOnMissingModelValidator();
+
     /** Column name IsJustMigrated */
     public static final String COLUMNNAME_IsJustMigrated = "IsJustMigrated";
 
diff --git a/base/src/org/compiere/model/ModelValidationEngine.java b/base/src/org/compiere/model/ModelValidationEngine.java
index 3b600e004f..f6e0f9925d 100644
--- a/base/src/org/compiere/model/ModelValidationEngine.java
+++ b/base/src/org/compiere/model/ModelValidationEngine.java
@@ -49,7 +49,9 @@ public class ModelValidationEngine
 	}	//	get
 	
 	/** Engine Singleton				*/
-	private static ModelValidationEngine s_engine = null; 
+	private static ModelValidationEngine s_engine = null;
+	/* flag to indicate a missing model validation class */
+	private static String missingModelValidationMessage = null; 
 	
 	
 	/**************************************************************************
@@ -77,7 +79,8 @@ public class ModelValidationEngine
 		{
 			//logging to db will try to init ModelValidationEngine again!
 			//log.warning(e.getLocalizedMessage());
-			System.err.println(e.getLocalizedMessage());
+			// System.err.println(e.getLocalizedMessage());
+			missingModelValidationMessage = missingModelValidationMessage + e.toString() + " global" + '\n';
 		}
 		
 		// Go through all Clients and start Validators 
@@ -91,7 +94,7 @@ public class ModelValidationEngine
 		}
 		//logging to db will try to init ModelValidationEngine again!
 		//log.config(toString());
-		System.out.println(toString());
+		// System.out.println(toString());
 	}	//	ModelValidatorEngine
 	
 	private void loadValidatorClasses(MClient client, String classNames) 
@@ -115,7 +118,8 @@ public class ModelValidationEngine
 			{
 				//logging to db will try to init ModelValidationEngine again!
 				//log.log(Level.SEVERE, className + ": " + e.getMessage());
-				System.err.println(className + ": " + e.getMessage());
+				// System.err.println(className + ": " + e.getMessage());
+				missingModelValidationMessage = missingModelValidationMessage + e.toString() + " on client " + client.getName() + '\n';
 			}
 		}
 	}
@@ -132,7 +136,8 @@ public class ModelValidationEngine
 		{
 			//logging to db will try to init ModelValidationEngine again!
 			//log.log(Level.SEVERE, className + ": " + e.getMessage());
-			System.err.println(className + ": " + e.getMessage());
+			// System.err.println(e.toString());
+			missingModelValidationMessage = missingModelValidationMessage + e.toString() + " on client " + client.getName() + '\n';
 		}
 	}
 	
@@ -187,6 +192,14 @@ public class ModelValidationEngine
 					return error;
 			}
 		}
+		if (AD_User_ID == 0 && AD_Role_ID == 0)
+			; // don't validate for user system on role system
+		else
+			if (missingModelValidationMessage != null) {
+				MSystem system = MSystem.get(Env.getCtx());
+				if (system.isFailOnMissingModelValidator())
+					return missingModelValidationMessage;
+			}
 		return null;
 	}	//	loginComplete
 	
diff --git a/base/src/org/compiere/model/X_AD_System.java b/base/src/org/compiere/model/X_AD_System.java
index 34f6f2044e..638ad707df 100644
--- a/base/src/org/compiere/model/X_AD_System.java
+++ b/base/src/org/compiere/model/X_AD_System.java
@@ -46,6 +46,8 @@ public class X_AD_System extends PO implements I_AD_System, I_Persistent
 			setInfo (null);
 			setIsAllowStatistics (false);
 			setIsAutoErrorReport (true);
+// Y
+			setIsFailOnMissingModelValidator (true);
 // Y
 			setName (null);
 			setPassword (null);
@@ -336,6 +338,27 @@ public class X_AD_System extends PO implements I_AD_System, I_Persistent
 		return false;
 	}
 
+	/** Set Fail on Missing Model Validator.
+		@param IsFailOnMissingModelValidator Fail on Missing Model Validator	  */
+	public void setIsFailOnMissingModelValidator (boolean IsFailOnMissingModelValidator)
+	{
+		set_Value (COLUMNNAME_IsFailOnMissingModelValidator, Boolean.valueOf(IsFailOnMissingModelValidator));
+	}
+
+	/** Get Fail on Missing Model Validator.
+		@return Fail on Missing Model Validator	  */
+	public boolean isFailOnMissingModelValidator () 
+	{
+		Object oo = get_Value(COLUMNNAME_IsFailOnMissingModelValidator);
+		if (oo != null) 
+		{
+			 if (oo instanceof Boolean) 
+				 return ((Boolean)oo).booleanValue(); 
+			return "Y".equals(oo);
+		}
+		return false;
+	}
+
 	/** Set Just Migrated.
 		@param IsJustMigrated 
 		Value set by Migration for post-Migation tasks.
diff --git a/migration/331b-trunk/061_BF1851188.sql b/migration/331b-trunk/061_BF1851188.sql
new file mode 100644
index 0000000000..2242937ec1
--- /dev/null
+++ b/migration/331b-trunk/061_BF1851188.sql
@@ -0,0 +1,23 @@
+-- Jan 8, 2008 7:04:17 PM COT
+-- [ 1851188 ] Missing ModelValidator must fail client to start
+INSERT INTO AD_Element (AD_Client_ID,AD_Element_ID,AD_Org_ID,ColumnName,Created,CreatedBy,Description,EntityType,Help,IsActive,Name,PrintName,Updated,UpdatedBy) VALUES (0,53324,0,'IsFailOnMissingModelValidator',TO_DATE('2008-01-08 19:04:14','YYYY-MM-DD HH24:MI:SS'),0,NULL,'D',NULL,'Y','Fail on Missing Model Validator','Fail on Missing Model Validator',TO_DATE('2008-01-08 19:04:14','YYYY-MM-DD HH24:MI:SS'),0)
+;
+
+INSERT INTO AD_Element_Trl (AD_Language,AD_Element_ID, Description,Help,Name,PO_Description,PO_Help,PO_Name,PO_PrintName,PrintName, IsTranslated,AD_Client_ID,AD_Org_ID,Created,Createdby,Updated,UpdatedBy) SELECT l.AD_Language,t.AD_Element_ID, t.Description,t.Help,t.Name,t.PO_Description,t.PO_Help,t.PO_Name,t.PO_PrintName,t.PrintName, 'N',t.AD_Client_ID,t.AD_Org_ID,t.Created,t.Createdby,t.Updated,t.UpdatedBy FROM AD_Language l, AD_Element t WHERE l.IsActive='Y' AND l.IsSystemLanguage='Y' AND l.IsBaseLanguage='N' AND t.AD_Element_ID=53324 AND EXISTS (SELECT * FROM AD_Element_Trl tt WHERE tt.AD_Language!=l.AD_Language OR tt.AD_Element_ID!=t.AD_Element_ID)
+;
+
+INSERT INTO AD_Column (AD_Client_ID,AD_Column_ID,AD_Element_ID,AD_Org_ID,AD_Reference_ID,AD_Table_ID,ColumnName,Created,CreatedBy,DefaultValue,EntityType,FieldLength,IsActive,IsAlwaysUpdateable,IsEncrypted,IsIdentifier,IsKey,IsMandatory,IsParent,IsSelectionColumn,IsSyncDatabase,IsTranslated,IsUpdateable,Name,SeqNo,Updated,UpdatedBy,Version) VALUES (0,54093,53324,0,20,531,'IsFailOnMissingModelValidator',TO_DATE('2008-01-08 19:04:46','YYYY-MM-DD HH24:MI:SS'),0,'Y','D',1,'Y','N','N','N','N','Y','N','N','N','N','Y','Fail on Missing Model Validator',0,TO_DATE('2008-01-08 19:04:46','YYYY-MM-DD HH24:MI:SS'),0,1.000000000000)
+;
+
+INSERT INTO AD_Column_Trl (AD_Language,AD_Column_ID, Name, IsTranslated,AD_Client_ID,AD_Org_ID,Created,Createdby,Updated,UpdatedBy) SELECT l.AD_Language,t.AD_Column_ID, t.Name, 'N',t.AD_Client_ID,t.AD_Org_ID,t.Created,t.Createdby,t.Updated,t.UpdatedBy FROM AD_Language l, AD_Column t WHERE l.IsActive='Y' AND l.IsSystemLanguage='Y' AND l.IsBaseLanguage='N' AND t.AD_Column_ID=54093 AND EXISTS (SELECT * FROM AD_Column_Trl tt WHERE tt.AD_Language!=l.AD_Language OR tt.AD_Column_ID!=t.AD_Column_ID)
+;
+
+ALTER TABLE AD_System ADD IsFailOnMissingModelValidator CHAR(1) DEFAULT 'Y' CHECK (IsFailOnMissingModelValidator IN ('Y','N')) NOT NULL
+;
+
+INSERT INTO AD_Field (AD_Client_ID,AD_Column_ID,AD_Field_ID,AD_Org_ID,AD_Tab_ID,Created,CreatedBy,DisplayLength,EntityType,IsActive,IsCentrallyMaintained,IsDisplayed,IsEncrypted,IsFieldOnly,IsHeading,IsReadOnly,IsSameLine,Name,SeqNo,SortNo,Updated,UpdatedBy) VALUES (0,54093,54236,0,440,TO_DATE('2008-01-08 19:08:25','YYYY-MM-DD HH24:MI:SS'),0,1,'D','Y','Y','Y','N','N','N','N','N','Fail on Missing Model Validator',235,0,TO_DATE('2008-01-08 19:08:25','YYYY-MM-DD HH24:MI:SS'),0)
+;
+
+INSERT INTO AD_Field_Trl (AD_Language,AD_Field_ID, Description,Help,Name, IsTranslated,AD_Client_ID,AD_Org_ID,Created,Createdby,Updated,UpdatedBy) SELECT l.AD_Language,t.AD_Field_ID, t.Description,t.Help,t.Name, 'N',t.AD_Client_ID,t.AD_Org_ID,t.Created,t.Createdby,t.Updated,t.UpdatedBy FROM AD_Language l, AD_Field t WHERE l.IsActive='Y' AND l.IsSystemLanguage='Y' AND l.IsBaseLanguage='N' AND t.AD_Field_ID=54236 AND EXISTS (SELECT * FROM AD_Field_Trl tt WHERE tt.AD_Language!=l.AD_Language OR tt.AD_Field_ID!=t.AD_Field_ID)
+;
+
diff --git a/migration/331b-trunk/postgresql/061_BF1851188.sql b/migration/331b-trunk/postgresql/061_BF1851188.sql
new file mode 100644
index 0000000000..65fbe50710
--- /dev/null
+++ b/migration/331b-trunk/postgresql/061_BF1851188.sql
@@ -0,0 +1,23 @@
+-- Jan 8, 2008 7:04:17 PM COT
+-- [ 1851188 ] Missing ModelValidator must fail client to start
+INSERT INTO AD_Element (AD_Client_ID,AD_Element_ID,AD_Org_ID,ColumnName,Created,CreatedBy,Description,EntityType,Help,IsActive,Name,PrintName,Updated,UpdatedBy) VALUES (0,53324,0,'IsFailOnMissingModelValidator',TO_TIMESTAMP('2008-01-08 19:04:14','YYYY-MM-DD HH24:MI:SS'),0,NULL,'D',NULL,'Y','Fail on Missing Model Validator','Fail on Missing Model Validator',TO_TIMESTAMP('2008-01-08 19:04:14','YYYY-MM-DD HH24:MI:SS'),0)
+;
+
+INSERT INTO AD_Element_Trl (AD_Language,AD_Element_ID, Description,Help,Name,PO_Description,PO_Help,PO_Name,PO_PrintName,PrintName, IsTranslated,AD_Client_ID,AD_Org_ID,Created,Createdby,Updated,UpdatedBy) SELECT l.AD_Language,t.AD_Element_ID, t.Description,t.Help,t.Name,t.PO_Description,t.PO_Help,t.PO_Name,t.PO_PrintName,t.PrintName, 'N',t.AD_Client_ID,t.AD_Org_ID,t.Created,t.Createdby,t.Updated,t.UpdatedBy FROM AD_Language l, AD_Element t WHERE l.IsActive='Y' AND l.IsSystemLanguage='Y' AND l.IsBaseLanguage='N' AND t.AD_Element_ID=53324 AND EXISTS (SELECT * FROM AD_Element_Trl tt WHERE tt.AD_Language!=l.AD_Language OR tt.AD_Element_ID!=t.AD_Element_ID)
+;
+
+INSERT INTO AD_Column (AD_Client_ID,AD_Column_ID,AD_Element_ID,AD_Org_ID,AD_Reference_ID,AD_Table_ID,ColumnName,Created,CreatedBy,DefaultValue,EntityType,FieldLength,IsActive,IsAlwaysUpdateable,IsEncrypted,IsIdentifier,IsKey,IsMandatory,IsParent,IsSelectionColumn,IsSyncDatabase,IsTranslated,IsUpdateable,Name,SeqNo,Updated,UpdatedBy,Version) VALUES (0,54093,53324,0,20,531,'IsFailOnMissingModelValidator',TO_TIMESTAMP('2008-01-08 19:04:46','YYYY-MM-DD HH24:MI:SS'),0,'Y','D',1,'Y','N','N','N','N','Y','N','N','N','N','Y','Fail on Missing Model Validator',0,TO_TIMESTAMP('2008-01-08 19:04:46','YYYY-MM-DD HH24:MI:SS'),0,1.000000000000)
+;
+
+INSERT INTO AD_Column_Trl (AD_Language,AD_Column_ID, Name, IsTranslated,AD_Client_ID,AD_Org_ID,Created,Createdby,Updated,UpdatedBy) SELECT l.AD_Language,t.AD_Column_ID, t.Name, 'N',t.AD_Client_ID,t.AD_Org_ID,t.Created,t.Createdby,t.Updated,t.UpdatedBy FROM AD_Language l, AD_Column t WHERE l.IsActive='Y' AND l.IsSystemLanguage='Y' AND l.IsBaseLanguage='N' AND t.AD_Column_ID=54093 AND EXISTS (SELECT * FROM AD_Column_Trl tt WHERE tt.AD_Language!=l.AD_Language OR tt.AD_Column_ID!=t.AD_Column_ID)
+;
+
+ALTER TABLE AD_System ADD COLUMN IsFailOnMissingModelValidator CHAR(1) DEFAULT 'Y' CHECK (IsFailOnMissingModelValidator IN ('Y','N')) NOT NULL
+;
+
+INSERT INTO AD_Field (AD_Client_ID,AD_Column_ID,AD_Field_ID,AD_Org_ID,AD_Tab_ID,Created,CreatedBy,DisplayLength,EntityType,IsActive,IsCentrallyMaintained,IsDisplayed,IsEncrypted,IsFieldOnly,IsHeading,IsReadOnly,IsSameLine,Name,SeqNo,SortNo,Updated,UpdatedBy) VALUES (0,54093,54236,0,440,TO_TIMESTAMP('2008-01-08 19:08:25','YYYY-MM-DD HH24:MI:SS'),0,1,'D','Y','Y','Y','N','N','N','N','N','Fail on Missing Model Validator',235,0,TO_TIMESTAMP('2008-01-08 19:08:25','YYYY-MM-DD HH24:MI:SS'),0)
+;
+
+INSERT INTO AD_Field_Trl (AD_Language,AD_Field_ID, Description,Help,Name, IsTranslated,AD_Client_ID,AD_Org_ID,Created,Createdby,Updated,UpdatedBy) SELECT l.AD_Language,t.AD_Field_ID, t.Description,t.Help,t.Name, 'N',t.AD_Client_ID,t.AD_Org_ID,t.Created,t.Createdby,t.Updated,t.UpdatedBy FROM AD_Language l, AD_Field t WHERE l.IsActive='Y' AND l.IsSystemLanguage='Y' AND l.IsBaseLanguage='N' AND t.AD_Field_ID=54236 AND EXISTS (SELECT * FROM AD_Field_Trl tt WHERE tt.AD_Language!=l.AD_Language OR tt.AD_Field_ID!=t.AD_Field_ID)
+;
+