Hi Martin
I am evaluating Express Invoice for a specific aplication where I need to always import a month at a time of new invoices. Your post got me thinking about templates as I also could not make the thing work! After messing around with CSV files for a couple of hours I belive I cracked it.
The import routine specifies Customer and Description as required fields what is missing is that you also need an Invoice code (I think they mean Invoice Number)
I they managed to import a CSV invoice file ok. It also updates any new items with their prices. I haven't checked to see if I can import new customers and their addresses.
If you have a problem try importing all the fields requested and them keep removing fields till it fails. Then use the last one as your template
Hope this works for you
Richard