Hi there

We have many expenses (flights, hotels, stationery etc) for which the supplier issues a proforma invoice and then supplies a tax invoice a few days later. The proforma invoices generally don't have any GST information on them.

Currently, we are manually maintaining a list of pending invoices and manually adding the GST invoices when we receive them. Obviously, this leave a lot of room for mistakes. 

What is the best way to handle this? 

Cheers!