# Transmission of the master data — NBN view ## Process flow from the perspective of the NB (NBN) \nSystem diagram: Übermittlung der Stammdaten — view of NB\n\n\nCustomer backend system\n\nMACO APP · NB (entspricht…\n\nMarket partner\n\n\n\n1. Stammdaten zu\nMarktlokation oder\nMesslokation\n\nMSB\n\nAS4\n44101, 44103\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n2. Aktualisierte Stammdaten\nzu Marktlokation oder\nMesslokation\n\n\nMSB\n\nAS4\n44102, 44104\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n3. Antwort\n\n\nLF\n\nAS4\n44105\n\nAPERAK check: Z33\n\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n"} gesamt={"\nSequence diagram: Übermittlung der Stammdaten — view of NB\n\n\nBackend (customer)\n\n\nMACO APP · NB (entspricht…\n\n\nMSB\n\n\nLF\n\n\n1. Stammdaten zu Marktlokation oder Messlokation\nAS4 · PI 44101, 44103\n\nUpdate transaction\nUpdate process data\n\n2. Aktualisierte Stammdaten zu Marktlokation ode…\nAS4 · PI 44102, 44104\n\nUpdate transaction\nUpdate process data\n\n3. Antwort\nAS4 · PI 44105\n\nUpdate transaction\nUpdate process data\n"} titel="NBN" /> ## Process steps ### Master data for market location or metering location
**Check identifiers** - [44101](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44101) — Master data for the metering location · AS4 - [44103](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44103) — Master data for the consuming market location · AS4
**Flow**
  1. Message to **MSB** · AS4
  2. **Write endpoint** - Transaction updated — [Update process data](/en/api/202610/backend-schreiben-nb/updateprocessdata#prozessdaten-aktualiseren) `POST /updateProcessData` Try it out Updates the existing transaction in the backend once the message has been created.
### Updated master data for market location or metering location
**Check identifiers** - [44102](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44102) — Updated master data for the metering location · AS4 - [44104](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44104) — Updated master data for the consuming market location · AS4
**Flow**
  1. Message to **MSB** · AS4
  2. **Write endpoint** - Transaction updated — [Update process data](/en/api/202610/backend-schreiben-nb/updateprocessdata#prozessdaten-aktualiseren) `POST /updateProcessData` Try it out Updates the existing transaction in the backend once the message has been created.
### Response
**Check identifiers** - [44105](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44105) — Rejection of master data for the consuming market location · AS4
**Flow**
  1. Message from **LF** · AS4
  2. **APERAK checks** - `44105` → `Z33`
  3. **Write endpoint** - Transaction updated — [Update process data](/en/api/202610/backend-schreiben-nb/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 The party involved on this page is itself the sender of: „Master data for market location or metering location“ to **MSB** (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/202610/LF/leitfaden-marktprozesse-netzbetreiberwechsel-ubermittlung-der-stammdaten) — LF - [View MSB](/en/prozessdoku/202610/MSB/leitfaden-marktprozesse-netzbetreiberwechsel-ubermittlung-der-stammdaten) — 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.* :::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), [2](#schritt-2) 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) 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), [2](#schritt-2), [3](#schritt-3)