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/document/DocumentObjectUtil.java
/**
	 * 
	 * @param documentObject
	 * @param dataType
	 * @param value
	 * @throws IOException
	 */
	public static void writeValue( IDocumentObject documentObject, int dataType, Object value ) throws IOException
	{
		if (value == null) 
		{
			documentObject.writeByte(0);
			return;
		} 
		else 
		{
			documentObject.writeByte(1);
		}
		switch ( dataType )
		{
			case DataType.BOOLEAN_TYPE :
				documentObject.writeBoolean( ( (Boolean) value ).booleanValue( ) );
				break;
			case DataType.INTEGER_TYPE :
				documentObject.writeInt( ( (Integer) value ).intValue( ) );
				break;
			case DataType.DOUBLE_TYPE :
				documentObject.writeDouble( ( (Double) value ).doubleValue( ) );
				break;
			case DataType.STRING_TYPE :