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Open e-PRIOR

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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.


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).


  • 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.
  • It supports the integration of multiple suppliers with possibly multiple back-offices of a contracting authority.
  • 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.
  • The application complies with:
    • CEN/BII Profiles
    • 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 (done in release 2.1.0)

Get involved

Where to start?
  • Read documentation about Open e-PRIOR, including a guide on how to get Open e-PRIOR running and the Software Architecture document
  • Download booklets with general and technical overview of e-PRIOR from the e-Library
  • Download the latest version of Open e-PRIOR
Contact our dedicated e-PRIOR team  

Public administration reference

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