Bug 180864 Change Allow Null option in Cascading Group.[0705]
Description: Change Allow Null option in Cascading Group. Build number:2.2.0.v20070404 Steps to reproduce: 1. New a cascading group and add sub parameter. Expected result: Is Required option in cascading group definition dialog. Actual result: Allow null value option in Cascading Group definition dialog Error log:N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
return null;
			}
			cmdh = DataSetUIUtil.getCachedMetaDataHandle( dataSet );
		}
		catch ( SemanticException e )
		{
		}
		String value = null;
		if ( COLUMN_VALUE.equals( column ) )
		{
			value = handle.getValueExpr( );
		}
		else
		{
			value = handle.getLabelExpr( );
		}
		if ( cmdh != null )
		{
			for ( Iterator iter = cmdh.getResultSet( ).iterator( ); iter.hasNext( ); )
			{
				ResultSetColumnHandle element = (ResultSetColumnHandle) iter.next( );
				if ( DEUtil.getColumnExpression( element.getColumnName( ) )
						.equalsIgnoreCase( value ) )
				{
					return element.getColumnName( );
				}
			}
		}
		return null;
	}