A prerequisite within Peppol is the standards. There are several different document types that you can send within Peppol:
There is a BIS, Business Interoperability Specifications, for each document type. The documents are produced by OpenPeppol and are maintained and supported by this member-driven organization. The advantage of these BIS variants is that all access points must comply with all of them. This is a requirement that the access points are obliged to fulfill. Access points must be able to send all BIS formats. Each individual format must be validated. This way, the receiver can be sure that what it receives complies with the standard.
The most common format in Peppol is the invoice, which is the same as Peppol BIS Billing 3. This is the format that Sweden's public recipients must be able to receive and that suppliers, according to law (2018:1277), must send in public procurement.
Peppol BIS Billing 3 complies with the European standard EN16931, which means that the format meets the requirements that unit codes must comply with the UN/ECF 20/21 code list, that attachments must be in specific formats (e.g. pdf, txt and csv) and that country and currency codes comply with the ISO standard. For example, it must say SE, not Sweden, in the address field.
Within Peppol, you can have specific rules for domestic transactions. Sweden has four mandatory rules:
Sweden has been restrictive in introducing country-specific rules. Other countries, such as Norway, have significantly more rules. Greece has the most with over 20 country-specific rules.
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