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Answers
#limit_validation_errors in back button not preventing validation
I can see the #limit_validation_errors applied to the back button on checkout pages, but I still can't go back when not having filled a #required field.
For reference:
http://drupal.org/node/875220
Comments
I can't confirm this problem; works fine for me. Are there more details about your site that you can share, like contribute modules or custom code interacting with the checkout form?