# Device replacement — MSBA view ## Process flow from the perspective of the MSB (MSBA) \nSystem diagram: Gerätewechsel — view of MSB\n\n\nCustomer backend system\n\nMACO APP · MSBA\n\nMarket partner\n\n\n\n1. Anzeige\nGeräte-wechselabsicht\n\nMSBN\n\nAS4\n17009\n\nLoad data for the incoming\ncheck\n\n\nMesslokation lesen\n\nAPI\n\nAPERAK check: Z10, Z18\n\n\nCreate transaction\n\n\nCreate process data\n\nAPI\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\nLoad data for the check\n\n\n2 read APIs called\n\nAPI\nlisted at the step\n\nProcess trigger received\n\n\nSTART_ANTWORT_GERAETE\nWECHSEL\n\nAPI\n\n2. Antwort\n\n\nMSBN\n\nAS4\n19015, 19016\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n3. Zeitpunkt Übernahme des\nMessstellenbetriebs\n\n\nMSBN\n\nAS4\n21010\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n5. Zählerstand und Zeitpunkt\ndes Geräteausbaus\n\n\nMSBN\n\nAS4\n13002, 13007\n\nLoad data for the incoming\ncheck\n\n\nZähler lesen\n\nAPI\n\nAPERAK check: MSCONS\n\n\nCreate transaction\n\n\nCreate process data\n\nAPI\n\n6. Zeitpunkt des\nGeräteausbaus\n\n\nMSBN\n\nAS4\n21036\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"} gesamt={"\nSequence diagram: Gerätewechsel — view of MSB\n\n\nBackend (customer)\n\n\nMACO APP · MSBA\n\n\nMSBN\n\n\n1. Anzeige Geräte-wechselabsicht\nAS4 · PI 17009\n\nCreate transaction\nCreate process data\n\nUpdate transaction\nUpdate process data\n\nSTART_ANTWORT_GERAETEWECHSEL\nTrigger event\n\n2. Antwort\nAS4 · PI 19015, 19016 · E_2007, E_2008\n\nUpdate transaction\nUpdate process data\n\n3. Zeitpunkt Übernahme des Messstellenbetriebs\nAS4 · PI 21010\n\nUpdate transaction\nUpdate process data\n\n5. Zählerstand und Zeitpunkt des Geräteausbaus\nAS4 · PI 13002, 13007\n\nCreate transaction\nCreate process data\n\n6. Zeitpunkt des Geräteausbaus\nAS4 · PI 21036\n\nUpdate transaction\nUpdate process data\n"} titel="MSBA" /> ## Process steps ### Notification of device replacement intent
**Check identifiers** - [17009](/en/schnittstellen/202604/pruefi/ORDERS/PI_17009) — Notification of device replacement intent · AS4
**Flow**
  1. Message from **MSBN** · 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** - `17009` → `Z10` - `17009` → `Z18`
  4. **Write endpoint** - Transaction created — `ERSTELLEN_PROZESSDATEN_BASIS` Creates a new transaction in the backend with the data of the incoming message.
  5. **Write endpoint** - Transaction updated — `AKTUALISIEREN_PROZESSDATEN_BASIS` Updates the existing transaction in the backend with the data of the incoming message.
  6. **Load data for the check** - [Read metering location](/en/api/202604/backend-lesen/getmeterlocationbasic#messlokation-lesen) `GET /getMeterLocationBasic` Try it - [Read meter](/en/api/202604/backend-lesen/getcounterbasic#zahler-lesen) `GET /getCounterBasic` Try it
### Response
**Check identifiers** - [19015](/en/schnittstellen/202604/pruefi/ORDRSP/PI_19015) — Confirmation of device replacement intent · AS4 - [19016](/en/schnittstellen/202604/pruefi/ORDRSP/PI_19016) — Rejection of device replacement intent · AS4
**Flow**
  1. **Prozessauslöser** [`START_ANTWORT_GERAETEWECHSEL`](/en/api/202604/ausloeser-msb/start-antwort-geraetewechsel) \",\n \"gewerbekennzeichnung\": \"\",\n \"name1\": \"\",\n \"name2\": \"\",\n \"name3\": \"\",\n \"name4\": \"\",\n \"partneradresse\": \"\"\n }\n }\n ]\n },\n \"transaktionsdaten\": {\n \"absender\": {\n \"marktrolle\": \"\",\n \"rollencodenummer\": \"\"\n },\n \"antwortstatus\": \"\",\n \"antwortstatusCodeliste\": \"\",\n \"empfaenger\": {\n \"marktrolle\": \"\",\n \"rollencodenummer\": \"\"\n },\n \"kategorie\": \"\",\n \"sparte\": \"\"\n },\n \"zusatzdaten\": {\n \"eventname\": \"START_ANTWORT_GERAETEWECHSEL\",\n \"prozessId\": \"\"\n }\n}"} security={[{"bearer": []}]}>Ausprobieren The backend triggers this step with this event.
  2. Message to **MSBN** · AS4
    **Response per decision tree** - `19015`, `19016` → `E_2008` - `19016` → `E_2007`
  3. **Write endpoint** - Transaction updated — `AKTUALISIEREN_PROZESSDATEN_BASIS` Updates the existing transaction in the backend once the message has been created.
### Point in time of takeover of metering point operation
**Check identifiers** - [21010](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21010) — Status message · AS4
**Flow**
  1. Message from **MSBN** · 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 with the data of the incoming message.
### Meter reading and point in time of the device removal
**Check identifiers** - [13002](/en/schnittstellen/202604/pruefi/MSCONS/PI_13002) — Meter reading (gas) · AS4 - [13007](/en/schnittstellen/202604/pruefi/MSCONS/PI_13007) — Gas quality · AS4
**Flow**
  1. Message from **MSBN** · AS4
  2. **Load data for the incoming check** - [Read meter](/en/api/202604/backend-lesen/getcounterbasic#zahler-lesen) `GET /getCounterBasic` Try it
  3. **APERAK checks** - `13002` → `MSCONS`
  4. **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.
### Point in time of device removal
**Check identifiers** - [21036](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21036) — Status message · AS4
**Flow**
  1. Message from **MSBN** · 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** - `21036` → `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.
## Process information
  1. ### First message **MSBN** sends “Notification of intended device change” (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 MSBN](/en/prozessdoku/202604/MSB--MSBN/awh-wim-gas-2-0-geratewechsel) — the receiving MSB · market role MSB *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 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: [3](#schritt-3), [6](#schritt-6) These write calls are not listed in the API catalogue of this format version; the step therefore shows only their command, without address and without button. Applies to: [1](#schritt-1), [2](#schritt-2) For these decision trees of the process there is no source in this format version: - `E_2007` - `E_2008`