Hi,
Nav 2013:
for Nav 2013 best buy an addon from a 3rd party provider. simple google for "e-invoice addon nav 2013". i found a couple of providers.
Nav 2016:
A good idea would be upgrading to Nav 2016. It provides import/export of e-documents with ready to use peppol format.
Business Central:
for e-invoice export simply use the e-document functionality. check out e-document formats.
if there are no entries goto cronus demo company (test envoronment), there should be some sample entries.
if not run "demo tool for contoso". that creates some "peppol bis3" based entries in the e-document format list.
for an peppol vs. 2.1 entry create the entry manually and use the according cu 1600.
the functionality is hardcoded, no data exch. definition (xml structure) is available, means editable.
you can only change the given codeunit, which uses a matching xmlport behind.
if that is done goto "document send profiles", there add a new entry, eg. "INV Peppol 2.1". Set code and description. In tab "send options" you see the fields for setting the data exchange manner. For exporting a ready to use e-invoice in peppol 2.1 xml format set field Disk to "Electronic Document" and Format to "Peppol 2.1", the e-document format you created before. All other fields set to No.
Goto a customer, do that best in the test environment, set the send profile to the just created "INV Peppol 2.1".
Create a sales invoice for that customer, post and send it. A e-invoice in peppol 2.1 xml format is created and downloaded.
Check it using an online peppol invoice validator.
If the send action fails then there is some data missing or wrong in the test company: UID, missing "your reference", etc.
Make the needed changes and try again.
Dipl.Ing. Franz Kalchmair