Hi. Your method seems OK; vendor for GST cheque and negative number for GST paid (creates a credit in account say, 2315); all this is fine.
Displaying balance sheet would then show GST paid as being added to total instead of subtracted?
ex.: if balance was 100.00, it is now 200.00?
Frankly, I would need to see your data file to understand the problem.
If you want, contact me outside the forum by email and we could arrange a remote meeting.
Daniel