Hi, Mike,
I just tested this using multi-currency sample data and didn't experience any problems. When the items are invoiced, the correct entries are sent to Ledger and you can see the amounts in both Home and Source currency. It may be that your Vendor setup isn't quite right.
This sort of thing can be difficult to troubleshoot on a forum like this. It might be best to contact your dealer and have them review the setup with you.
_________________________
Regards,
Softrak Tech Support