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Can you be more specific? What do you mean when you use a promotion code in backend? In frontend I assume you mean during the basket process in CBSubs? Try unpublishing all your promotion codes and creating a new one with a flat discount for 1 then see if the issue persists using that promotion code.I get the error message "Unknown column 'pm' in 'field list'" in front and backend, when I use a promotion code.
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