Bug 182296 Crosstab - non-numeric measures
Feature request. Looking at the 2.2.M6 release, it seems that measures (the fields that can be in the matrix part of the output) need to be numeric. I looked at the spec documents and it seems there is no requirement for non-numeric measures
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/data/util/DiskIndex.java
/**
	 * 
	 * @throws IOException
	 */
	private void closeWriteDocumentObject( ) throws IOException
	{
		if ( documentObject != null )
		{
			documentObject.close( );
			documentObject = null;
		}
		if ( offsetDocumentObject != null )
		{
			offsetDocumentObject.close( );
			offsetDocumentObject = null;
		}
	}
	
	/**
	 * 
	 * @throws IOException
	 */
	private void openReadDocumentObject( ) throws IOException
	{
		if ( documentObject == null )
		{
			documentObject = documentManager.openDocumentObject( name );
			documentObject.seek( 0 );
		}