# Request for and provision of meter readings — MSB view ## Process flow from the perspective of the MSB \nSystem diagram: Anforderung und Bereitstellung von Messwerten — view of MSB\n\n\nCustomer backend system\n\nMACO APP · MSB\n\nMarket partner\n\n\n\n1. Weitergabe\nEinzelanforderung\n(außerhalb der…\n\nNB\n\nAS4\n17004\n\nCreate transaction\n\n\nCreate process data\n\nAPI\n\nEBD check: G_0075\nAnforderung von Werten\nprüfen (Gas)\n\n\nTrigger follow-up process:\n19007\n\n\nTriggered by incoming\nmessage: 17004\n\n\n2. Ablehnung\n\n\nNB\n\nAS4\n19007\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\nProcess trigger received\n\n\n2 alternative events\n\nAPI\n\n3. Messwertübermittlung\n\n\nNB\n\nAS4\n13002, 13006, 13008…\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n4. Mitteilung über\ngescheiterte Auslesung\n\n\nNB\n\nAS4\n21028\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n5. Übermittlung Ersatzwerte\n\n\nNB\n\nAS4\n13002, 13006, 13008…\n\nLoad data for the incoming\ncheck\n\n\n3 read APIs called\n\nAPI\nlisted at the step\n\nAPERAK check: MSCONS,\nZ33\n\n\nCreate transaction\n\n\nCreate process data\n\nAPI\nPI 13002, 13008, 13009\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\nPI 13006\n"} gesamt={"\nSequence diagram: Anforderung und Bereitstellung von Messwerten — view of MSB\n\n\nBackend (customer)\n\n\nMACO APP · MSB\n\n\nNB\n\n\nLF\n\n\n1. Weitergabe Einzelanforderung (außerhalb der T…\nAS4 · PI 17004\n\nCreate transaction\nCreate process data\n\n2. Ablehnung\nAS4 · PI 19007 · E_3009\nE_3009 — Anforderung prüfen\n\nUpdate transaction\nUpdate process data\n\n2 alternative events\nTrigger event\n\n3. Messwertübermittlung\nAS4 · PI 13002, 13006, 13008…\n\nUpdate transaction\nUpdate process data\n\n4. Mitteilung über gescheiterte Auslesung\nAS4 · PI 21028\n\nUpdate transaction\nUpdate process data\n\n5. Übermittlung Ersatzwerte\nAS4 · PI 13002, 13006, 13008…\n\nCreate transaction\nCreate process data · PI 13002, 13008, 13009\n\nUpdate transaction\nUpdate process data · PI 13006\n\n6. Messwertübermittlung\nAS4 · PI 13002, 13006, 13008…\n"} titel="MSB" /> ## Process steps ### Forwarding of an individual request (outside the periodic meter reading)
**Check identifiers** - [17004](/en/schnittstellen/202604/pruefi/ORDERS/PI_17004) — Request for values · AS4
**Flow**
  1. Message from **NB** · AS4
  2. **Write endpoint** - Transaction created — [Create process data](/en/api/202604/backend-schreiben-msb/createprocessdata#prozessdaten-erstellen) `POST /createProcessData` Try it out Creates a new transaction in the backend with the data of the incoming message.
  3. **Decision tree** - `17004` → `G_0075` — Check request for values (Gas)
  4. **Trigger follow-up process** - [19007](/en/schnittstellen/202604/pruefi/ORDRSP/PI_19007) — Rejection of request for values After processing, the MACO APP starts this follow-up process itself.
### Rejection
**Check identifiers** - [19007](/en/schnittstellen/202604/pruefi/ORDRSP/PI_19007) — Rejection of request for values · AS4
**Flow**
  1. **Triggered by incoming message** - [17004](/en/schnittstellen/202604/pruefi/ORDERS/PI_17004) — Request for values The MACO APP sends this message itself, as a follow-up process after this incoming message.
  2. Message to **NB** · AS4
    **Response per decision tree** - `19007` → [E_3009](/en/referenz/202604/ebd/E_3009) · Check request
  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 once the message has been created.
### Meter reading transmission
**Check identifiers** - [13002](/en/schnittstellen/202604/pruefi/MSCONS/PI_13002) — Meter reading (gas) · AS4 - [13006](/en/schnittstellen/202604/pruefi/MSCONS/PI_13006) — Meter reading value cancellation · AS4 - [13008](/en/schnittstellen/202604/pruefi/MSCONS/PI_13008) — Load curve (gas) · AS4 - [13009](/en/schnittstellen/202604/pruefi/MSCONS/PI_13009) — Energy quantity (gas) · AS4
**Flow**
  1. **Process trigger** - [`START_ERHEBUNG_MESSWERTE`](/en/api/202604/ausloeser-msb/start-erhebung-messwerte) \"\n ],\n \"lokationsId\": \"\"\n }\n ],\n \"ZAEHLER\": [\n {\n \"zaehlernummer\": \"\"\n }\n ]\n },\n \"transaktionsdaten\": {\n \"absender\": {\n \"rollencodenummer\": \"\"\n },\n \"anfrageReferenz\": \"\",\n \"empfaenger\": {\n \"rollencodenummer\": \"\"\n },\n \"kategorie\": \"\",\n \"lokationsTyp\": \"\",\n \"sparte\": \"\",\n \"typ\": \"\"\n },\n \"zusatzdaten\": {\n \"eventname\": \"START_ERHEBUNG_MESSWERTE\",\n \"prozessId\": \"\"\n }\n}"} security={[{"bearer": []}]}>Ausprobieren - [`START_MESSWERTUEBERMITTLUNG`](/en/api/202604/ausloeser-msb/start-messwertuebermittlung) \"\n ],\n \"lokationsId\": \"\"\n }\n ],\n \"ZAEHLER\": [\n {\n \"zaehlernummer\": \"\"\n }\n ]\n },\n \"transaktionsdaten\": {\n \"pruefidentifikator\": \"\"\n },\n \"zusatzdaten\": {\n \"eventname\": \"START_MESSWERTUEBERMITTLUNG\",\n \"prozessId\": \"\"\n }\n}"} security={[{"bearer": []}]}>Ausprobieren The backend triggers this step with one of these events.
  2. Message to **NB** · AS4
  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 once the message has been created.
### Notification of failed read-out
**Check identifiers** - [21028](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21028) — Information notification · 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.
### Transmission of substitute values
**Check identifiers** - [13002](/en/schnittstellen/202604/pruefi/MSCONS/PI_13002) — Meter reading (gas) · AS4 - [13006](/en/schnittstellen/202604/pruefi/MSCONS/PI_13006) — Meter reading value cancellation · AS4 - [13008](/en/schnittstellen/202604/pruefi/MSCONS/PI_13008) — Load curve (gas) · AS4 - [13009](/en/schnittstellen/202604/pruefi/MSCONS/PI_13009) — Energy quantity (gas) · AS4
**Flow**
  1. Message from **NB** · AS4
  2. **Load data for the incoming check** - [Read meter](/en/api/202604/backend-lesen/getcounterbasic#zahler-lesen) `GET /getCounterBasic` Try it - [Read market location](/en/api/202604/backend-lesen/getmarketlocationbasic#marktlokation-lesen) `GET /getMarketLocationBasic` Try it - [Read metering location](/en/api/202604/backend-lesen/getmeterlocationbasic#messlokation-lesen) `GET /getMeterLocationBasic` Try it
  3. **APERAK checks** - `13002`, `13008`, `13009` → `MSCONS` - `13006` → `Z33`
  4. **Write endpoint** - `13002`, `13008`, `13009` → Transaction created — [Create process data](/en/api/202604/backend-schreiben-msb/createprocessdata#prozessdaten-erstellen) `POST /createProcessData` Try it out Creates a new transaction in the backend with the data of the incoming message.
  5. **Write endpoint** - `13006` → 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.
### Meter reading transmission This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [13002](/en/schnittstellen/202604/pruefi/MSCONS/PI_13002) — Meter reading (gas) · AS4 - [13006](/en/schnittstellen/202604/pruefi/MSCONS/PI_13006) — Meter reading value cancellation · AS4 - [13008](/en/schnittstellen/202604/pruefi/MSCONS/PI_13008) — Load curve (gas) · AS4 - [13009](/en/schnittstellen/202604/pruefi/MSCONS/PI_13009) — Energy quantity (gas) · AS4
Decision trees of this process | EBD | Name | |---|---| | [E_3009](/referenz/202604/ebd/E_3009) | Check request |
## Process information
  1. ### First message **NB** sends “Passing on of an individual request (outside the periodic meter reading)” (step 1). From here on, it is the turn of the party involved on this page.
## 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 LF](/en/prozessdoku/202604/LF/geli-gas-2-0-anforderung-und-bereitstellung-von-messwerten) — LF - [View NB](/en/prozessdoku/202604/NB/geli-gas-2-0-anforderung-und-bereitstellung-von-messwerten) — 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.* :::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 connector table lists no write call for these steps. Derived from the process flow: the own role was already involved in this process, so the transaction already exists. Applies to: [5](#schritt-5)