Hi - Thank you both for your help.  Just by chance something caught my eye, so i investigated further.  There were innumerable (:smileylol:) Sales Tax Items, most of which were turned off.  I discovered one of these inactive items was the one P was referenced to.  I think that has solved that problem. 

However, this other PST Item uses a different sales account - 3500 vs the 2200 I want.  can I reassign the account, and if so, where?