Since there is no Tax setup in G/L, if the PST Account balance in the G/L has been changed (via journal entries posted to this account), this would have no affect whatsoever on any other ACCPAC Plus module, let alone a 'global change'.

There could however, be several reasons why your PST is not calculating correctly in QIP - here are some suggestions as to what you can check for...

1. If you go into the Tax tables maintenance in QIP, is there more than one Tax Group defined? If so, are you sure the Items and/or Customers are actually using the one that you say "was already changed"?

2. If you have selected the correct Tax Group, when you enter the Tax Table Maintenance screen, are BOTH the Item and Customer areas changed for PST? They should both say 7.5%, not just the Item tax table. QIP looks at the Customer Tax Status first to decide whether or not to charge any tax that is defined for the item(s) on the invoice. Therefore, if only the item tax table was modified for PST, this would explain why it is still calculating at 7% rather than the 7.5%. This is what I am guessing to be the likely cause.

3. Changes to the Tax Groups and/or Tax types will not be saved if you have open batches or if there is information stored in the Tax summary report. (You will get a warning to that effect when you first try to enter those areas.) If you have open batches, archive them (you can restore them after making the changes in the Tax Group area). Print and clear the Tax Summary report. If necessary you can combine this report with the one printed at month end to accurately reflect the month's totals for tax.

Hope this helps!
Regards