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
*         list, otherwise <code>false</code>.
	 */
	public boolean isMustMatch( )
	{
		return getBooleanProperty( MUCH_MATCH_PROP );
	}
	/**
	 * Sets the flag indicates that whether the value must match one of values
	 * in the selection list.
	 * 
	 * @param mustMatch
	 *            <code>true</code> if the value must match one of values in
	 *            the list, otherwise <code>false</code>.
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setMustMatch( boolean mustMatch ) throws SemanticException
	{
		setProperty( MUCH_MATCH_PROP, Boolean.valueOf( mustMatch ) );
	}
	/**
	 * Tests whether to display values in the order defined in the list.
	 * 
	 * 
	 * @return <code>true</code> if to display value in the order, otherwise
	 *         <code>false</code>.
	 */
	public boolean isFixedOrder( )
	{
		return getBooleanProperty( FIXED_ORDER_PROP );