# Start of metering point operation — MSBN view ## Process flow from the perspective of the MSB (MSBN) \nSystem diagram: Beginn Messstellenbetrieb — view of MSB\n\n\nCustomer backend system\n\nMACO APP · MSBN\n\nMarket partner\n\n\n\n1. Anmeldung\n\nNB\n\nAS4\n44042\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n2. Antwort auf Anmeldung\n\n\nNB\n\nAS4\n44044, 44043\n\nAPERAK check: Z33\n\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\nLoad data for the check\n\n\nMesslokation lesen\n\nAPI\n\n6. Mitteilung über\nGesamtvorgang\n\n\nNB\n\nAS4\n21009, 21010\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n7. Antwort auf Mitteilung\nüber Gesamtvorgang\n\n\nNB\n\nAS4\n21011, 21012\n\nAPERAK check: Z33\n\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\nLoad data for the check\n\n\nMesslokation lesen\n\nAPI\n\n10. Mitteilung über das\nScheitern des\nGesamtvorgangs\n\n\nNB\n\nAS4\n21013\n\nLoad data for the incoming\ncheck\n\n\nMesslokation lesen\n\nAPI\n\nAPERAK check: Z10\n\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\nLoad data for the check\n\n\nMesslokation lesen\n\nAPI\n"} gesamt={"\nSequence diagram: Beginn Messstellenbetrieb — view of MSB\n\n\nBackend (customer)\n\n\nMACO APP · MSBN\n\n\nNB\n\n\nMSBA\n\n\n1. Anmeldung\nAS4 · PI 44042\n\nUpdate transaction\nUpdate process data\n\n2. Antwort auf Anmeldung\nAS4 · PI 44044, 44043 · E_2002\n\nUpdate transaction\nUpdate process data\n\n3. Information über vorläufige Anmeldebestätigung\nAS4 · PI 21007\n\n6. Mitteilung über Gesamtvorgang\nAS4 · PI 21009, 21010\n\nUpdate transaction\nUpdate process data\n\n7. Antwort auf Mitteilung über Gesamtvorgang\nAS4 · PI 21011, 21012 · E_2003\n\nUpdate transaction\nUpdate process data\n\n9. Information über Scheitern der Zuordnung\nAS4 · PI 21013\n\n10. Mitteilung über das Scheitern des Gesamtvorga…\nAS4 · PI 21013\n\nUpdate transaction\nUpdate process data\n\n11. Information über Scheitern der Zuordnung\nAS4 · PI 21013\n"} titel="MSBN" /> ## Process steps ### Registration
**Check identifiers** - [44042](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44042) — Registration MSB · AS4
**Flow**
  1. Message to **NB** · 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.
### Response to registration
**Check identifiers** - [44044](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44044) — Rejection of registration MSB · AS4 - [44043](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44043) — Confirmation of registration MSB · AS4
**Flow**
  1. Message from **NB** · AS4
    **Response per decision tree** - `44044`, `44043` → `E_2002`
  2. **APERAK checks** - `44044`, `44043` → `Z33`
  3. **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 with the data of the incoming message.
  4. **Load data for the check** - [Read metering location](/en/api/202604/backend-lesen/getmeterlocationbasic#messlokation-lesen) `GET /getMeterLocationBasic` Try it
### Information about preliminary registration confirmation This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [21007](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21007) — Status message · AS4
### Notification of the overall transaction
**Check identifiers** - [21009](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21009) — Status message · AS4 - [21010](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21010) — Status message · AS4
**Flow**
  1. Message to **NB** · 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.
### Response to notification of the overall transaction
**Check identifiers** - [21011](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21011) — Status message · AS4 - [21012](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21012) — Status message · AS4
**Flow**
  1. Message from **NB** · AS4
    **Response per decision tree** - `21011`, `21012` → `E_2003`
  2. **APERAK checks** - `21011`, `21012` → `Z33`
  3. **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 with the data of the incoming message.
  4. **Load data for the check** - [Read metering location](/en/api/202604/backend-lesen/getmeterlocationbasic#messlokation-lesen) `GET /getMeterLocationBasic` Try it
### Information on failure of the assignment This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [21013](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21013) — Status message · AS4
### Notification of the failure of the overall transaction
**Check identifiers** - [21013](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21013) — Status message · AS4
**Flow**
  1. Message from **NB** · AS4
  2. **Load data for the incoming check** - [Read metering location](/en/api/202604/backend-lesen/getmeterlocationbasic#messlokation-lesen) `GET /getMeterLocationBasic` Try it
  3. **APERAK checks** - `21013` → `Z10`
  4. **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 with the data of the incoming message.
  5. **Load data for the check** - [Read metering location](/en/api/202604/backend-lesen/getmeterlocationbasic#messlokation-lesen) `GET /getMeterLocationBasic` Try it
### Information on failure of the assignment This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [21013](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21013) — Status message · AS4
## Process information
  1. ### First message The party involved on this page is itself the sender of: „Registration“ to **NB** (step 1).
## 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 MSBA](/en/prozessdoku/202604/MSB--MSBA/awh-wim-gas-2-0-beginn-messstellenbetrieb) — the transferring MSB · market role MSB - [View NB](/en/prozessdoku/202604/NB/awh-wim-gas-2-0-beginn-messstellenbetrieb) — NB *The source provides no use case profile for this process — objective, precondition and result are not recorded there.* *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 numbers are those of the source; where one is missing, it is missing there.* :::caution{title="Step sequence reconstructed"} For this process, the BNetzA consolidated version carries no sequence diagram. The steps are reconstructed from the BDEW check identifier table: grouped by the designation, ordered by the process step. The method agrees with the consolidated version in 200 of 200 cases that can be cross-checked — the individual line is nevertheless not editorially reviewed. Check it against the rulebook before adopting it into an implementation specification. ::: The source does not yet name the event that triggers these steps. Applies to: [1](#schritt-1) For the check identifiers of these steps there is no test case in the test data set; the »Try it out« button of the write interface therefore offers no body. Applies to: [1](#schritt-1) For these decision trees of the process there is no source in this format version: - `E_2002` - `E_2003`