cancellation invoices

[dwarfi09]

It would be great if we could use secretariat also for cancellation invoices. If I understand the standard correctly, a different type code would need to be used and a reference to the original document would need to be established.

At the moment, however, the type code is fixed:

  # invoice.rb, Line 167
  xml['ram'].TypeCode '380' # TODO: make configurable

I am also unsure about the schema for the reference; it should be something like this:

      <ram:AdditionalReferencedDocument>
        <ram:IssuerAssignedID>RE2024-12345</ram:IssuerAssignedID>
        <ram:TypeCode>380</ram:TypeCode>
        <ram:FormattedIssueDateTime>
          <qdt:DateTimeString format="102">20241109</qdt:DateTimeString>
        </ram:FormattedIssueDateTime>
      </ram:AdditionalReferencedDocument>

Is something in that direction planned?

Thank you!

[halfbyte]

@dwarfi09 I would love to support this and I actually do have a use case for it (It's just not very important, because we don't do a ton of cancellations).

I'm up for taking a PR for this but it would probably take a bit of refactoring so I can understand if you don't want to tackle this yourself. Also, let me point to #24 :-D