Making sure you're recording your transactions the right way is a good exercise for preventing errors in your books.
I recommend contacting an accounting professional to get more info on how to properly record the PST in your books. If you're not in contact with one, I encourage you to search for one on our website using this link here. Doing this will help prevent any future discrepancies. In case you need to add the tax code in your books, Let me know if you have other questions. I'm here to help.