I am to small a business so don't pay GST it muddled all my accounts. be cool it there was an option to not add to my account just the receipt.
For this one, it would be best if you have a chat to your bookkeeper, accountant or give MYOB support a call to make sure you have your MYOB business setup correctly. Your suppliers will charge GST to be claimed rather than pay (you can only claim if your are registered, but they will still charge it regardless). It will be your invoices which should not have GST rather than theirs.
MYOB Capture Team