Can a CDR be changed after it was sent?

Not directly. OCPI treats CDRs like invoices: a wrong CDR is cancelled with a credit CDR and replaced by a corrected one.

Explained in

OCPI and roaming · Stop 06How does a CDR settle a session?The charge detail record from session end to invoice: push or pull, signed meter data, and why a CDR is never deleted, only credited.

A CDR is used for billing and can be seen as a kind of invoice, so OCPI does not allow it to be deleted. If a CDR turns out to be wrong, the operator sends a credit CDR for it, and then a new, corrected CDR. Both sides keep the full history.

From “Never deleted, only credited”, stop 06

Terms

  1. OCPIOpen Charge Point Interface: an open protocol for roaming between operators and e-mobility service providers.
  2. CDRCharge detail record: the digital receipt of a session, with energy, duration and tariff.
  3. Credit CDRA record that cancels a CDR already sent; OCPI does not allow CDRs to be deleted, so corrections run through credit CDRs.
  1. What does OCPI exchange?Locations and tariffs from the operator, tokens from the provider before a session; sessions and commands during it; the CDR after it.
  2. What is a roaming hub?A platform that connects many operators and providers through one link each. Many organisations use OCPI in a hybrid way, with hubs and direct connections side by side.
  3. How is a roaming card authorised?Either from a cached list the provider shared with the operator, or by a real-time check with the provider. The provider sets which, per token.
  4. What is in a CDR?Who wrote it, the token that started it, the one EVSE used, the tariff as it applied, the session as periods with energy and time, and the totals before taxes. The deep dive reads a complete record line by line.
  1. EVRoaming Foundation: OCPI 2.3.0, CDRs module: credit CDRs, push and pull model. https://github.com/ocpi/ocpi/blob/2.3.0/release/core/mod_cdrs.asciidoc. Checked 09 Oct 2026.