diff --git a/org.adempiere.base/src/org/compiere/model/Callout.java b/org.adempiere.base/src/org/compiere/model/Callout.java
index 30dc16b2e9..59501e7024 100644
--- a/org.adempiere.base/src/org/compiere/model/Callout.java
+++ b/org.adempiere.base/src/org/compiere/model/Callout.java
@@ -45,7 +45,7 @@ public interface Callout
 	 *  @return Error message or ""
 	 */
 	public String start (Properties ctx, String method, int WindowNo,
-		IGridTab mTab, GridField mField, Object value, Object oldValue);
+		GridTab mTab, GridField mField, Object value, Object oldValue);
 
 	/**
 	 *	Conversion Rules.
diff --git a/org.adempiere.base/src/org/compiere/model/CalloutEngine.java b/org.adempiere.base/src/org/compiere/model/CalloutEngine.java
index 3ae344e3b0..b901767056 100644
--- a/org.adempiere.base/src/org/compiere/model/CalloutEngine.java
+++ b/org.adempiere.base/src/org/compiere/model/CalloutEngine.java
@@ -49,7 +49,7 @@ public class CalloutEngine implements Callout
 
 	/** Logger					*/
 	protected CLogger		log = CLogger.getCLogger(getClass());
-	private IGridTab m_mTab;
+	private GridTab m_mTab;
 	private GridField m_mField;
 
 	/**
@@ -70,7 +70,7 @@ public class CalloutEngine implements Callout
 	 *  @return Error message or ""
 	 */
 	public String start (Properties ctx, String methodName, int WindowNo,
-		IGridTab mTab, GridField mField, Object value, Object oldValue)
+		GridTab mTab, GridField mField, Object value, Object oldValue)
 	{
 		if (methodName == null || methodName.length() == 0)
 			throw new IllegalArgumentException ("No Method Name");
@@ -267,7 +267,7 @@ public class CalloutEngine implements Callout
 	 * 
 	 * @return gridTab
 	 */
-	public IGridTab getGridTab() 
+	public GridTab getGridTab() 
 	{
 		return m_mTab;
 	}
diff --git a/org.adempiere.base/src/org/compiere/model/GridTab.java b/org.adempiere.base/src/org/compiere/model/GridTab.java
index 0c49eb3732..32c18ae1d5 100644
--- a/org.adempiere.base/src/org/compiere/model/GridTab.java
+++ b/org.adempiere.base/src/org/compiere/model/GridTab.java
@@ -106,7 +106,7 @@ import org.compiere.util.ValueNamePair;
  *  @author Paul Bowden, phib BF 2900767 Zoom to child tab - inefficient queries
  *  @see https://sourceforge.net/tracker/?func=detail&aid=2900767&group_id=176962&atid=879332
  */
-public class GridTab implements IGridTab, DataStatusListener, Evaluatee, Serializable
+public class GridTab implements DataStatusListener, Evaluatee, Serializable
 {
 	
 
diff --git a/org.adempiere.base/src/org/compiere/model/IGridTab.java b/org.adempiere.base/src/org/compiere/model/IGridTab.java
deleted file mode 100644
index d9a225866d..0000000000
--- a/org.adempiere.base/src/org/compiere/model/IGridTab.java
+++ /dev/null
@@ -1,31 +0,0 @@
-/******************************************************************************
- * Copyright (C) 2012 Elaine Tan                                              *
- * Copyright (C) 2012 Trek Global
- * This program is free software; you can redistribute it and/or modify it    *
- * under the terms version 2 of the GNU General Public License as published   *
- * by the Free Software Foundation. This program is distributed in the hope   *
- * that it will be useful, but WITHOUT ANY WARRANTY; without even the implied *
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.           *
- * See the GNU General Public License for more details.                       *
- * You should have received a copy of the GNU General Public License along    *
- * with this program; if not, write to the Free Software Foundation, Inc.,    *
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.                     *
- *****************************************************************************/
-package org.compiere.model;
-
-/**
- * 
- * @author Elaine
- *
- */
-public interface IGridTab {
-	public String setValue(String columnName, Object value);
-	public String setValue(GridField field, Object value);
-	public Object getValue(String columnName);
-	public Object getValue(GridField field);
-	
-	public String[] getActiveCallouts();
-	public Callout[] getActiveCalloutInstance();
-	
-	public String processCallout(GridField field);
-}