# Cancellation of values from MSB of the metering location — View MSB-MELO The MSB of the market location transmits a cancellation for values already transmitted to the parties that previously received the values to be cancelled. The MSB of the metering location transmits a cancellation for values already transmitted to the MSB of the market location. ## Process flow from the perspective of the MSB (MSB-MELO) \nSystem diagram: Stornierung Werte vom MSB der Messlokation — view of MSB\n\n\nCustomer backend system\n\nMACO APP · MSB (entsprich…\n\nMarket partner\n\n\n\n1. Stornierung\n\nMSB (entspricht MSB a…\n\nAS4\n13006\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n"} gesamt={"\nSequence diagram: Stornierung Werte vom MSB der Messlokation — view of MSB\n\n\nBackend (customer)\n\n\nMACO APP · MSB (entsprich…\n\n\nMSB (entspricht MSB am Ob…\n\n\n1. Stornierung\nAS4 · PI 13006\n\nUpdate transaction\nUpdate process data\n"} titel="MSB-MELO" /> ## Process steps ### Cancellation
**Check identifiers** - [13006](/en/schnittstellen/202604/pruefi/MSCONS/PI_13006) — Meter reading value cancellation · AS4
**Flow**
  1. Message to **MSB (corresponds to MSB at the market location object)** · AS4
  2. **Write endpoint** - Transaction updated — [Update process data](/en/api/202604/backend-schreiben-msb/updateprocessdata#prozessdaten-aktualiseren) `POST /updateProcessData` Try it out Updates the existing transaction in the backend once the message has been created.
## Process information Wording of the consolidated version, profile ch. 2.8.1, p. 55.
  1. ### Preconditions - Values were transmitted previously. - The values subject to complaint are relevant for cancellation.
  2. ### Results For values relevant to cancellation, the values can be transmitted again.
  3. ### Trigger - Check result from the complaint provides for cancellation or - a value transmitted to the market by mistake has to be cancelled.
  4. ### First message The party involved on this page is itself the sender of: „Cancellation“ to **MSB (corresponds to MSB on the market location object)** (step 1).
  5. ### Objective Cancellation of transmitted values at all parties involved.
## Other views of the process The same process through the eyes of the other parties involved: the same steps, each read from their point of view. - [View MSB-MALO](/en/prozessdoku/202604/MSB--MSB-MALO/WiM-Teil2-stornierung-werte-vom-msb-der-messlokation) — MSB at the market location object · market role MSB *The steps are the **possible** messages of this process, not a sequence — the source lists neither conditions nor alternatives. The small box on the step names the own view on the left: with **←** it receives, with **→** it sends. Collapsed steps run between other market partners.* The source does not yet name the event that triggers these steps. Applies to: [1](#schritt-1)