Bug 312859 The list of operator for Chart filter does not provide 30 visible items
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/dialogs/ChartCubeFilterConditionBuilder.java
expButton.getExpressionType( ) );
				filter.setExpressionProperty( FilterCondition.EXPR_MEMBER,
						expression );
				if ( valueVisible == 3 )
				{
					filter.setValue1( valueList );
					filter.setValue2( "" ); 
				}
				else
				{
					assert ( !expressionValue1.isDisposed( ) );
					assert ( !expressionValue2.isDisposed( ) );
					if ( expressionValue1.getVisible( ) )
					{
						filter.setValue1( DEUtil.resolveNull( expressionValue1.getText( ) ) );
					}
					else
					{
						filter.setValue1( NULL_STRING );
					}
					if ( expressionValue2.getVisible( ) )
					{
						filter.setValue2( DEUtil.resolveNull( expressionValue2.getText( ) ) );
					}
					else
					{
						filter.setValue2( NULL_STRING );
					}
				}