If your dimension members does not reflect the structure of your report you can adjust the order of the elements by clicking the "Dimension Hierarchy" icon according to the image below.
Sometimes you can get feedback from your auditors saying that you should check that the elements are used in the same order as in the human-readable version (the XHTML file).
Once you have clicked the button you will be able to change the place of your member tags by "drag and drop" the tags in the order you want.
Once the dimension elements are in the correct order, click Save.