Did you know that from April 1st you must provide your invoices to public hospitals, communities and states electronically! This is an European requirement.
what is an E-invoice then? It is not a pdf copy of your normal paper invoice! It must meet the requirements in PEPPOL BIS Billing 3. Read more about the standard here
If you do public business better ask your system provider if they meet the requirements, if not you must act now!
The new requirements are valid for new tenders or direct buy and hence not valid for tender that was won before the date.
You can read more about the new law here. This link is in Swedish.