# Request for master data change from the MSB to NB (responsible) — MSB view ## Process flow from the perspective of the MSB \nSystem diagram: Anfrage zur Stammdatenänderung vom MSB an NB (verantwortlich) — view of MSB\n\n\nCustomer backend system\n\nMACO APP · MSB\n\nMarket partner\n\n\n\nProcess trigger received\n\nSTART_BESTELLUNG_SDAE_\nGAS\n\nAPI\n\n1. Anfrage an NB von MSB\n\n\nNB\n\nAS4\n44140\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n2. Antwort auf Anfrage an NB\nvon MSB\n\n\nNB\n\nAS4\n44142\n\nAPERAK check: Z33\n\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n"} gesamt={"\nSequence diagram: Anfrage zur Stammdatenänderung vom MSB an NB (verantwortlich) — view of MSB\n\n\nBackend (customer)\n\n\nMACO APP · MSB\n\n\nNB\n\n\nLF\n\n\nSTART_BESTELLUNG_SDAE_GAS\nTrigger event\n\n1. Anfrage an NB von MSB\nAS4 · PI 44140\n\nUpdate transaction\nUpdate process data\n\n2. Antwort auf Anfrage an NB von MSB\nAS4 · PI 44142 · E_3026\nE_3026 — Anfrage zur Stammdatenänderung prüfen\n\nUpdate transaction\nUpdate process data\n\n3. Ggf. Änderung vom NB an LF\nAS4 · PI 44117, 44160\n\n4. Antwort auf Änderung vom NB an LF\nAS4 · PI 44119, 44161 · E_3027\nE_3027 — Änderung vom NB prüfen\n"} titel="MSB" /> ## Process steps ### Request to NB from MSB
**Check identifiers** - [44140](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44140) — Not bal.-rel. request to NB · AS4
**Flow**
  1. **Prozessauslöser** [`START_BESTELLUNG_SDAE_GAS`](/en/api/202604/ausloeser-msb/start-bestellung-sdae-gas) \"\n }\n ]\n },\n \"transaktionsdaten\": {\n \"absender\": {\n \"marktrolle\": \"\",\n \"rollencodenummer\": \"\"\n },\n \"empfaenger\": {\n \"marktrolle\": \"\",\n \"rollencodenummer\": \"\"\n },\n \"gueltigAb\": \"\",\n \"kategorie\": \"\",\n \"sparte\": \"\",\n \"transaktionsgrund\": \"\",\n \"transaktionsgrundergaenzung\": \"\"\n },\n \"zusatzdaten\": {\n \"eventname\": \"START_BESTELLUNG_SDAE\",\n \"prozessId\": \"\"\n }\n}"} security={[{"bearer": []}]}>Ausprobieren The backend triggers this step with this event.
  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.
### Response to request to NB from MSB
**Check identifiers** - [44142](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44142) — Response to request · AS4
**Flow**
  1. Message from **NB** · AS4
    **Response per decision tree** - `44142` → [E_3026](/en/referenz/202604/ebd/E_3026) · Check request for master data change
  2. **APERAK checks** - `44142` → `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.
### Change from NB to LF, if applicable This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [44117](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44117) — Change from MSB with dependencies · AS4 - [44160](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44160) — Change from MSB without dependencies · AS4
### Response to change from the NB to LF This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [44119](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44119) — Response to change from MSB · AS4 - [44161](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44161) — Response to change · AS4
**Response per decision tree** - `44119`, `44161` → [E_3027](/en/referenz/202604/ebd/E_3027) · Check change from the NB
Decision trees of this process | EBD | Name | |---|---| | [E_3026](/referenz/202604/ebd/E_3026) | Check request for master data change | | [E_3027](/referenz/202604/ebd/E_3027) | Check change from the NB |
## Process information
  1. ### First message The party involved on this page sends this itself: “Request to NB from MSB” 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 LF](/en/prozessdoku/202604/LF/geli-gas-2-0-anfrage-zur-stammdatenanderung-vom-msb-an-nb-verantwortlich) — LF - [View NB](/en/prozessdoku/202604/NB/geli-gas-2-0-anfrage-zur-stammdatenanderung-vom-msb-an-nb-verantwortlich) — 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. :::