# Transmission of price sheet MSB to LF — LF view The MSB transmits its electronic price sheet to the LF if the LF does not have the electronic price sheet or if at least one price component of the price sheet has changed. ## Process flow from the perspective of the LF \nSystem diagram: Übermittlung Preisblatt MSB an LF — view of LF\n\n\nCustomer backend system\n\nMACO APP · LF\n\nMarket partner\n\n\n\n1. Preisblatt\n\nMSB\n\nAS4\n27002\n\nAPERAK check: Z33\n\n\nCreate transaction\n\n\nCreate process data\n\nAPI\nkategorie = A\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\nkategorie = B\n"} gesamt={"\nSequence diagram: Übermittlung Preisblatt MSB an LF — view of LF\n\n\nBackend (customer)\n\n\nMACO APP · LF\n\n\nMSB\n\n\n1. Preisblatt\nAS4 · PI 27002\n\nCreate transaction\nCreate process data · kategorie = A\n\nUpdate transaction\nUpdate process data · kategorie = B\n"} titel="LF" /> ## Process steps ### Price sheet
**Check identifiers** - [27002](/en/schnittstellen/202604/pruefi/PRICAT/PI_27002) — Price sheets for MSB services · AS4
**Flow**
  1. Message from **MSB** · AS4
  2. **APERAK checks** - `27002` → `Z33` — APERAK check: Is referenced message known ?
  3. **Write endpoint** - `kategorie = A` → Transaction created — [Create process data](/en/api/202604/backend-schreiben-lf/createprocessdata#prozessdaten-erstellen) `POST /createProcessData` Try it out Creates a new transaction in the backend with the data of the incoming message.
  4. **Write endpoint** - `kategorie = B` → Transaction updated — [Update process data](/en/api/202604/backend-schreiben-lf/updateprocessdata#prozessdaten-aktualiseren) `POST /updateProcessData` Try it out Updates the existing transaction in the backend with the data of the incoming message.
## Process information Wording of the consolidated version, profile ch. 3.6.2.3.1, p. 67.
  1. ### Preconditions - The EDIFACT communication between MSB and LF has been established. - The LF does not have the current or updated price sheet of the MSB.
  2. ### Results The billing of the metering point operation can be created.
  3. ### Error case #### Result in the error case In the error cases, the price sheet is transmitted again. #### Error cases - Price sheet contains an error - Price sheet was not transmitted in the current version - Price sheet was not transmitted in full Price sheet does not begin at 00:00 of a calendar day.
  4. ### First message **MSB** sends “Price sheet” (step 1). From here on, it is the turn of the party involved on this page.
  5. ### Objective The LF has the electronic price sheet of the MSB.
## 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 MSB](/en/prozessdoku/202604/MSB/WiM-Teil1-uebermittlung-preisblatt-msb-an-lf) — MSB *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.*