How do I test UBL files?

E-invoicing is used in i-Reserve by means of UBL.
Background information about UBL can be found here: https://nl.wikipedia.org/wiki/Universal_Business_Language

If everything is set up correctly, it is no longer necessary to view the UBL files.
After all, they are automatically sent along.

To get there, it can be useful to test a UBL file.
This can be done by granting a right: action_invoice_createubl

After granting this right, an action button will appear in the action block of an invoice.
A UBL file can then be created and downloaded. And possibly tested in an accounting package.

Don't forget to remove the permission after the test.