Please define custom order of attributes in MDX of the chart.

Here is an example of MDX for stacked bar chart where we have custom ordering of attributes:

SELECT 
NON EMPTY { HIERARCHIZE({ [Organization].[Organizations].&[5] }) } ON COLUMNS,
NON EMPTY { 
         [Date].[Fiscal Year].&[2006],
         [Date].[Fiscal Year].&[2008],
         [Date].[Fiscal Year].&[2007]
} ON ROWS
FROM [Finance]


As you can see years are placed in custom order.