Brucanna, did you read the original post ? It is a fact that some businesses that are not GST registered will have to process invoices from businesses that are GST registered, If such a GST registered supplier refuses to list GST inclusive prices on their invoice, but only adds the GST at the end on the invoice total, then that does create a problem for our business that is not GST registered. Taking the supplier to court over this is not an option for most people, so we have to deal with it ourselves.
hineshouse, I have been able to work around this issue by using the discount field. On your Purchase Invoice line items, enter the GST exclusive price and add -15% discount (negative 15%), assuming your GST rate is 15%. That seems to work fine as a workaround.