Bug 211703 Support muti-view on report item.
As title described.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/internal/CrosstabReportItemTask.java
* name from the design tree.
	 * 
	 * @param name
	 *            name of the dimension view to remove
	 * @throws SemanticException
	 */
	public void removeDimension( String name ) throws SemanticException
	{
		DimensionViewHandle dimensionView = crosstab.getDimension( name );
		if ( dimensionView == null )
		{
			crosstab.getLogger( ).log( Level.SEVERE,
					MessageConstants.CROSSTAB_EXCEPTION_DIMENSION_NOT_FOUND,
					name );
			throw new CrosstabException( crosstab.getModelHandle( )
					.getElement( ), new String[]{name,
					crosstab.getModelHandle( ).getElement( ).getIdentifier( )},
					MessageConstants.CROSSTAB_EXCEPTION_DIMENSION_NOT_FOUND );
		}
		removeDimension( dimensionView.getAxisType( ), dimensionView.getIndex( ) );
	}
	/**
	 * Removes a row/column dimension view in the given position. The axis type
	 * can be either <code>ICrosstabConstants.ROW_AXIS_TYPE</code> or
	 * <code>ICrosstabConstants.COLUMN_AXIS_TYPE</code>. And index is 0-based
	 * integer.
	 * 
	 * @param axisType
	 *            row/column axis type
	 * @param index