Charging PST in an invoice in Simply Accounting 2007 Basic

Hi, while preparing an invoice for a customer in Simply Accounting 2007 Basic, I selected G2 as the Tax code, meaning 6% GST and 7% PST. The GST calculated correctly, but the PST didn't calculate at all... nothing
appeared on the PST line. Is this a defect, or do I need to configure the Tax differently? Thanks in advance for your help! Gregg.
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