Hi Earl,
Thought I would provide an update for you about the issue I posted about a few month ago, just in case anyone else comes across this same sort of thing.
I didn't end up contacting MYOB but kept thinking about the issue. I still don't know what happened or the cause but I did work out a fix.
I ended up changing the tax code in the credit note to N-T, and cleared the original purchase. Then created a journal on same date to reverse the N-T tax code and re-code to GST. Balance sheet GST accounts now back in balance in both cash and accrual versions. GST reports correct, BAS still correct.
Thanks for your original reply, It got me thinking...
Regards
Jennifer