Bug 168026 Still use the existing data binding even though the aggregate is different
I had a table in which a data binding which aggregates on a group. When I insert a new data item in the report, although the expressions are same, it aggregates on All, then it refered to the existing data binding. The expected behavior would be a new data binding is created with different aggregates.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ScalarParameterHandle.java
}
	/**
	 * Sets the flag indicates that whether to display values in the order
	 * defined in the list.
	 * 
	 * @param fixedOrder
	 *            <code>true</code> if to display values in the order,
	 *            otherwise <code>false</code>.
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setFixedOrder( boolean fixedOrder ) throws SemanticException
	{
		setProperty( FIXED_ORDER_PROP, Boolean.valueOf( fixedOrder ) );
	}
	/**
	 * Returns the iterator for the static selection list defined on this scalar
	 * parameter. Each element in the iterator is the an instance of
	 * <code>SelectionChoiceHandle</code>.
	 * 
	 * @return the iterator for selection list defined on this scalar parameter.
	 * 
	 * @see org.eclipse.birt.report.model.api.elements.structures.SelectionChoice
	 */
	public Iterator choiceIterator( )
	{
		PropertyHandle propHandle = getPropertyHandle( SELECTION_LIST_PROP );
		return propHandle.iterator( );
	}
	/**