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/ReportItemHandle.java
}
	/**
	 * Returns the expression evalueated as a table of contents entry for this
	 * item.
	 * 
	 * @return the expression evaluated as a table of contents entry for this
	 *         item
	 * @see #setTocExpression(String)
	 * @deprecated
	 */
	public String getTocExpression( )
	{
		TOCHandle tocHandle = getTOC( );
		if ( tocHandle == null )
			return null;
		return tocHandle.getExpression( );
	}
	/**
	 * Gets the on-prepare script of the group. Startup phase. No data binding
	 * yet. The design of an element can be changed here.
	 * 
	 * @return the on-prepare script of the group
	 * 
	 */
	public String getOnPrepare( )
	{
		return getStringProperty( IReportItemModel.ON_PREPARE_METHOD );
	}
	/**