# Metering location change from NB to MSB — MSB-MELO view The process describes the interactions between the NB and MSB of the metering location in the case where the NB orders a change to technical equipment of the metering location without a change of MSB taking place at the same time. The MSB of the metering location checks whether a metering location change has to be carried out on the basis of the order issuance by the NB. The MSB of the metering location also checks without delay whether the desired change date named with the order issuance can be met for technical or operational reasons. Where necessary, it must promptly agree a date with the AN for this purpose. If it is foreseeable that the date cannot be met, it determines the next possible date on which the desired change can be made. Once the checks have been carried out, the MSB of the metering location replies to the NB within the deadline with an order confirmation or a rejection. ## Process flow from the perspective of the MSB (MSB-MELO) \nSystem diagram: Messlokationsänderung vom NB an MSB — view of MSB\n\n\nCustomer backend system\n\nMACO APP · MSB (entsprich…\n\nMarket partner\n\n\n\n1. Beauftragung Änderung\n\nNB\n\nAS4\n17011\n\nCreate transaction\n\n\nCreate process data\n\nAPI\n\n2. Antwort\n\n\nNB\n\nAS4\n19005, 19006\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n5. Scheitern der Änderung\n\n\nNB\n\nAS4\n21027\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n"} gesamt={"\nSequence diagram: Messlokationsänderung vom NB an MSB — view of MSB\n\n\nBackend (customer)\n\n\nMACO APP · MSB (entsprich…\n\n\nNB\n\n\n1. Beauftragung Änderung\nAS4 · PI 17011\n\nCreate transaction\nCreate process data\n\n2. Antwort\nAS4 · PI 19005, 19006 · E_0249\nE_0249 — Beauftragung zur Messlokationsänderung prüfen\n\nUpdate transaction\nUpdate process data\n\n5. Scheitern der Änderung\nAS4 · PI 21027 · E_0286\nE_0286 — Messlokationsänderung durchführen\n\nUpdate transaction\nUpdate process data\n"} titel="MSB-MELO" /> ## Process steps ### Order issuance change
**Check identifiers** - [17011](/en/schnittstellen/202604/pruefi/ORDERS/PI_17011) — Order placement quotation change of technology · 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.
### Response
**Check identifiers** - [19005](/en/schnittstellen/202604/pruefi/ORDRSP/PI_19005) — Confirmation of order change of technology · AS4 - [19006](/en/schnittstellen/202604/pruefi/ORDRSP/PI_19006) — Rejection of order change of technology · AS4
**Flow**
  1. Message to **NB** · AS4
    **Response per decision tree** - `19005`, `19006` → [E_0249](/en/referenz/202604/ebd/E_0249) · MSB · Check order issuance for metering location change
  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.
### Failure of the change
**Check identifiers** - [21027](/en/schnittstellen/202604/pruefi/IFTSTA/PI_21027) — Status message · AS4
**Flow**
  1. Message to **NB** · AS4
    **Response per decision tree** - `21027` → [E_0286](/en/referenz/202604/ebd/E_0286) · MSB · Carry out metering location change
  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.
Decision trees of this process | EBD | Name | |---|---| | [E_0249](/referenz/202604/ebd/E_0249) | Check order issuance for metering location change | | [E_0286](/referenz/202604/ebd/E_0286) | Carry out metering location change |
## Process information Wording of the consolidated version, profile ch. 3.3.1.1, pp. 51–52.
  1. ### Preconditions The NB can demand a change of the metering location from the MSB of the metering location if and to the extent that it is entitled to do so on the basis of legal provisions or bilateral agreements with the MSB of the metering location. Possible reasons include: a) changed requirements for the metering equipment in accordance with the minimum technical requirements of the NB applicable to the metering location, due to: a. a change of the grid usage contract between the NB and the grid user (LF or AN), b. a change of the consumption behaviour of the AN, c. structural changes affecting the metering location; b) a change of the minimum technical requirements of the NB due to changed legal provisions.
  2. ### Results - If the order issuance is confirmed by MSB of the metering location and the change at the metering location has been carried out successfully, MSB of the metering location sends the changed master data. - The changes carried out in this use case may, among other things, result in a transmission of values being required. For this purpose the SD „[Processing and transmission of values from the MSB of the metering location](/en/prozessdoku/202604/MSB--MSB-MALO/WiM-Teil2-aufbereitung-und-uebermittlung-von-werten-vom-msb-der-messlokation)“ (WiM part 2) is carried out. The order issuance for the transmission of values results from the values of the corresponding master data item. No further order issuance is made towards MSB.
  3. ### Error case #### Result in the error case If the MSB of the metering location was not able to carry out the change on time (e.g. because the measuring equipment was permanently unreachable), it notifies the NB that the change has failed.
  4. ### Further requirements Note: The process steps required when ordering a configuration (e.g. change of balancing procedure, metering time period definition of the NB) are not to be triggered via this process; they must be triggered via the use cases of the chapter „Order placement of a configuration“ (GPKE part 3). The creation of the device-related prerequisites for ordering a configuration via these GPKE use cases can, where applicable, be commissioned via the use cases described here for changing the metering location or as part of the device replacement.
  5. ### First message **NB** sends “Order issuance for change” (step 1). From here on, it is the turn of the party involved on this page.
  6. ### Objective The change to the metering location ordered by the NB has been carried out by the MSB of the metering location.
## 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 NB](/en/prozessdoku/202604/NB/WiM-Teil1-messlokationsaenderung-vom-nb-an-msb) — NB *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.* The connector table lists no write call for these steps. Derived from the process flow: the process begins for the own role with their message, so the transaction is created. 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)