Currently if you have a landed cost that has a GST free portion (such as customs fees) as well as a GST inclusive portion and even a 100% GST portion, you have to record each as a separate expense line in Neto to ensure the GST is calculated correctly. When the expense lines transfer to Xero each expense line creates a separate draft bill even when all the expenses are on 1 invoice.
I believe either the API either needs work so it recognises the invoice number is the same on multiple expense lines and only creates 1 invoice when importing into Xero or the landed cost expense in Neto needs the ability to manually enter the GST value of an invoice rather than it either calculating 10% GST or being entirely GST free.