Business Central integrations come with a default set of information or data. These are the ones most users need

You may need to adapt the information or data you send to your customers, like adapting/customizing paper invoices and credit memos for special needs

Below are links to available fields that can be added to your documents

Invoices

Peppol BIS Billing 3.0 | Structure

Credit memo

Peppol BIS Billing 3.0 | Structure

Then place the line and indent as they should appear in PEPPPOL

Places is mandatory

You typed in the Field Name incorrectly, so you need to pick from the drop down list Alt Arrow Down.