thanks all.
I think the simplest solution and it seems to work perfectly fine (at least in Canada) is the following:
Company is in Canadian Dollars
Supplier - tax exempt (Supplier is in a different currency)
GL Account for Custom Duties
Send a normal PO with the supplier price in his currency.
After receiving the PO, create a "Supplier Invoices'
Manually enter the Account for Custom Duties (note, it will need to be converted to the Supplier currency because the invoice follows the supplier currency, even thou the Invoice sent is normally already converted to either US or CAD dollars)
Manually enter the GST tax - also converted to the supplier currency.
system will display the "Sales Tax" at the bottom of the invoice, but it won't add twice.
Please folks correct me if I am making a mistake here and/or leading others to do something wrong.
Who should I talk to to find out more a potential partnership with frontaccounting? Any idea Joe?
thanks