Bug 118750 Insert group for table from library, system throws exception.
Insert group for table from library, system throws exception. Steps: 1.Insert a tabel from library 2.Insert group Actual Results: 1.System throws exception A Birt exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Model Plug-in ID:org.eclipse.birt.report.model Version:1.0.1 Error Code:Error.ContentException.STRUCTURE_CHANGE_FORBIDDEN Error Message:Element "report.Body[1]" is child element or a virtual element( inside the child ), can not change its structure. Expected Results: 1.Can be inserted group
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/core/model/schematic/TableHandleAdapter.java
* 
	 * @param columns
	 *            The columns to be deleted.
	 * @throws SemanticException
	 */
	public void deleteColumn( int[] columns ) throws SemanticException
	{
		if ( columns == null )
		{
			return;
		}
		transStar( TRANS_LABEL_DELETE_COLUMNS );
		if ( getColumnCount( ) == columns.length )
		{
			getHandle( ).drop( );
			transEnd( );
			return;
		}
		Arrays.sort( columns );
		List temp = new ArrayList( );
		int len = columns.length;
		for ( int i = 0; i < len; i++ )
		{
			temp.add( getColumn( columns[i] ) );
		}
		for ( int i = 0; i < len; i++ )
		{
			
			deleteColumn( HandleAdapterFactory.getInstance( )
					.getColumnHandleAdapter( temp.get( i ) )