Bug 210047 The grand total key should not appear in the new sort key editor
Build ID: I20071101-2000 Steps To Reproduce: 1.New a cube and add a x-tab to the layout 2.add data to the x-tab and show the grand total 3.open the property editor's sorting tab, click "Add" to add a new sort key. Expect: the grand total key should not appear in the key list
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/CubeQueryUtil.java
{
		private IDatasetIterator dataSetIterator;
		private boolean hasNext;
		private Map levelValueMap;
		private String targetLevelName;
		private Object currentValue;
		private String attribute;
		
		public MemberValueIterator( IDatasetIterator it, Map levelValueMap, String targetLevelName, String attribute )
		{
			this.dataSetIterator = it;
			this.hasNext = true;
			this.levelValueMap = levelValueMap;
			this.targetLevelName = targetLevelName;
			this.attribute = attribute;