GP2013 is no longer in main stream support so the tax codes are not updated for that version. There are often programmatic and tax rate changes, so I strongly encourage you to upgrade to a version that is supported for year end. There are tons of new features and bug fixes in more current versions. I know that may not be what you were looking for as a response to your question, but I felt like it was worth sharing. I am not aware of a way to do this 'on your own'.
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