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Open e-PRIOR

3.57/5 | 14 votes
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Open e-PRIOR is an open-source e-procurement platform that allows practical implementation of interoperable electronic services within any public administration.

It plays the role of intermediary between the back-office applications of the public administration and the Pan-European Public Procurement OnLine (PEPPOL) interoperability initiative. It has been designed to interoperate with a large number of applications of heterogeneous nature. The platform is connected to PEPPOL via its own Access Point, facilitating the cross-border exchange of e-procurement documents between, for example, a public administration in country A with suppliers in country B.

Open e-PRIOR currently covers:

  • e-submission, i.e. submission and opening of tenders;
  • post-award e-procurement, i. e. documents exchanged between the public administration and its contractors after the award of a contract, such as invoices.

The Open e-PRIOR package includes also a web portal allowing suppliers, such as SME and individuals, to manually encode their invoices via a web form.

e-PRIOR infographic


The platform has been developed under the ISA (Interoperability Solutions for European Public Administrations) programme, by the Directorate-General for Informatics (DIGIT) of the European Commission and it was deployed within DIGIT in 2009. Other Directorate-Generals, European Agencies and Institutions are implementing the system and it is freely available to all Members States wishing to exchange standardised electronic procurement documents via secured communication channels.

The interfaces of Open e-PRIOR are based on the Business Profiles defined by CEN's workshop on Business Interoperability Interfaces for Public Procurement in Europe (CEN/ISSS WS/BII).


1. It is an integrated environment that offers web services to exchange procurement documents. The application guarantees authenticity of origin and integrity of content for all exchanged documents. It also integrates an archiving functionality. 2. It supports the integration of multiple suppliers with possibly multiple back-offices of a contracting authority. 3. It is connected to the PEPPOL infrastructure via its own turnkey PEPPOL gateway, thereby enabling the secure exchange of electronic documents via the PEPPOL network. Any supplier connected to PEPPOL has, by design, a connection to all contracting authorities which implemented Open e-PRIOR and vice-versa. 4. The application complies with:
  • CEN/BII Profiles (using the binding to UBL 2.0 compliant with XML 1.0 and XSD 1.1, business rules expressed as Schematron 1.5 asserts)
  • the e-invoicing directive
  • standard identifiers and standard code lists
  • the WS-Interoperability guidelines

Future plans

In the next release in Q2 2017 the following features will be added to the Open e-PRIOR platform:
  • Migration of e-invoice to UBL 2.1

Get involved

Where to start? Contact our dedicated e-PRIOR team
  • In the forum
  • By e-mail:
Get Involved
  • If you want to participate please register at the project website and participate in the Open e-PRIOR community. We are looking forward to have you on board.
  • Join our e-PRIOR group on LinkedIn and follow the latest news
  • Follow us also on Twitter @e-PRIOR_EU

Public administration reference

Open e-PRIOR is supported by the ISA programme of the European Commission.