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
* </ul>
	 * 
	 * @param controlType
	 *            the control type for the UI to display the parameter
	 * 
	 * @throws SemanticException
	 *             if the input type is not one of above choices.
	 * @see #getDataType()
	 * @see org.eclipse.birt.report.model.api.elements.DesignChoiceConstants
	 */
	public void setControlType( String controlType ) throws SemanticException
	{
		setStringProperty( CONTROL_TYPE_PROP, controlType );
	}
	/**
	 * Returns the alignment for this parameter. Alignments can be one of the
	 * constants defined in <code>DesignChoiceConstants</code>:
	 * 
	 * <ul>
	 * <li><code>SCALAR_PARAM_ALIGN_AUTO</code>
	 * <li><code>SCALAR_PARAM_ALIGN_LEFT</code>
	 * <li><code>SCALAR_PARAM_ALIGN_CENTER</code>
	 * <li><code>SCALAR_PARAM_ALIGN_RIGHT</code>
	 * </ul>
	 * 
	 * @return the alignment for the UI to display the parameter
	 * 
	 * @see org.eclipse.birt.report.model.api.elements.DesignChoiceConstants
	 */
	public String getAlignment( )