Bug 200478 Name of date/time group level issue[1101]
Description: Name of date/time group level issue[1101] Step: 1. New a sample datasource and dataset from orders. 2. New a data cube and binding to the dataset. 3. Drop the column of "ORDERDATE" to group and select the year type. At this time, the name of group level is "year(ORDERDATE: DateTime)" 4. Edit the the group level. 5. Change the type as month. Actual result: The name of group level is "year(ORDERDATE: DateTime, DateTime)" Expected result: The name of group level is "year(ORDERDATE: DateTime)"
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/PropertyCommand.java
* refferenced when setting
	 * <code>IDesignElementModel.REF_TEMPLATE_PARAMETER_PROP</code> null.
	 * 
	 * @param prop
	 *            should be
	 *            <code>IDesignElementModel.REF_TEMPLATE_PARAMETER_PROP</code>.
	 * @param value
	 *            should be null;
	 * @throws SemanticException
	 *             if any semantic exception is thrown.
	 */
	private void clearRefTemplateParameterProp( ElementPropertyDefn prop,
			Object value ) throws SemanticException
	{
		checkAllowedOperation( );
		assert prop != null;
		assert IDesignElementModel.REF_TEMPLATE_PARAMETER_PROP.equals( prop
				.getName( ) );
		ActivityStack stack = module.getActivityStack( );
		stack.startTrans( );
		try
		{
			ElementRefValue templateParam = (ElementRefValue) element
					.getProperty( module, prop );
			TemplateParameterDefinition definition = (TemplateParameterDefinition) templateParam
					.getElement( );
			doSetProperty( prop, value );
			if ( definition != null && !definition.hasReferences( ) )
			{
				ContentCommand cmd = new ContentCommand( definition.getRoot( ),