# Start of supply — LFA view ## Process flow from the perspective of the LF (LFA) \nSystem diagram: Lieferbeginn — view of LF\n\n\nCustomer backend system\n\nMACO APP · LF (entspricht…\n\nMarket partner\n\n\n\n3. Abmeldeanfrage\n\nNB\n\nAS4\n44010\n\nLoad data for the incoming\ncheck\n\n\nMarktlokation lesen\n\nAPI\n\nAPERAK check: Z10, Z17,\nZ18\n\n\nCreate transaction\n\n\nCreate process data\n\nAPI\n\nLoad data for the check\n\n\n3 read APIs called\n\nAPI\nlisted at the step\n\nEBD check: G_0009_G_0010\nAblehnung / Bestätigung\nAbmeldungsanfrage\n\n\nTrigger follow-up process:\n44011, 44012\n\n\nTriggered by incoming\nmessage: 44010\n\n\nLoad data for processing\n\n\n3 read APIs called\n\nAPI\nlisted at the step\n\n4. Beantwortung der\nAbmeldeanfrage\n\n\nNB\n\nAS4\n44011, 44012\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n\n6. Mitteilung über\nBeendigung der Zuordnung\n\n\nNB\n\nAS4\n44037\n\nLoad data for the incoming\ncheck\n\n\nMarktlokation lesen\n\nAPI\n\nAPERAK check: Z10, Z17,\nZ18\n\n\nCreate transaction\n\n\nCreate process data\n\nAPI\n"} gesamt={"\nSequence diagram: Lieferbeginn — view of LF\n\n\nBackend (customer)\n\n\nMACO APP · LF (entspricht…\n\n\nLF (entspricht LFN)\n\n\nNB\n\n\nLF (zukünfitge LF)\n\n\n1. Anmeldung\nAS4 · PI 44001\n\n2. Information über existierende Zuordnung\nAS4 · PI 44036\n\n3. Abmeldeanfrage\nAS4 · PI 44010\n\nCreate transaction\nCreate process data\n\n4. Beantwortung der Abmeldeanfrage\nAS4 · PI 44011, 44012 · E_3020\nE_3020 — Abmeldung prüfen\n\nUpdate transaction\nUpdate process data\n\n5. Antwort auf Anmeldung\nAS4 · PI 44003, 44002 · E_3005, E_3007\nE_3005 — Prüfen, ob Anmeldung direkt ablehnbar\nE_3007 — Lieferbeginn prüfen\n\n6. Mitteilung über Beendigung der Zuordnung\nAS4 · PI 44037\n\nCreate transaction\nCreate process data\n\n7. Information über die Aufhebung einer zukünfti…\nAS4 · PI 44038\n"} titel="LFA" /> ## Process steps ### Registration This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [44001](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44001) — NN registration · AS4
### Information about existing assignment This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [44036](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44036) — Information notification about existing assignment · AS4
### Deregistration request
**Check identifiers** - [44010](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44010) — Deregistration request from the NB · AS4
**Flow**
  1. Message from **NB** · AS4
  2. **Load data for the incoming check** - [Read market location](/en/api/202610/backend-lesen/getmarketlocationbasic#marktlokation-lesen) `GET /getMarketLocationBasic` Try it
  3. **APERAK checks** - `44010` → `Z10` — APERAK check: Is location known ? - `44010` → `Z17` - `44010` → `Z18`
  4. **Write endpoint** - Transaction created — [Create process data](/en/api/202610/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.
  5. **Load data for the check** - [Read energy supply contract](/en/api/202610/backend-lesen/getenergysupplycontractbasic#energieliefervertrag-lesen) `GET /getEnergySupplyContractBasic` Try it - [Read market location](/en/api/202610/backend-lesen/getmarketlocationbasic#marktlokation-lesen) `GET /getMarketLocationBasic` Try it - [Read grid usage contract](/en/api/202610/backend-lesen/getgridusagecontractbasic#netznutzungsvertrag-lesen) `GET /getGridUsageContractBasic` Try it
  6. **Decision tree** - `44010` → `G_0009_G_0010` — Rejection / confirmation of deregistration request
  7. **Trigger follow-up process** - [44011](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44011) — Confirmation of deregistration request - [44012](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44012) — Rejection of deregistration request After processing, the MACO APP starts the follow-up process itself; which of them runs depends on the result of the processing.
### Response to the deregistration request
**Check identifiers** - [44011](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44011) — Confirmation of deregistration request · AS4 - [44012](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44012) — Rejection of deregistration request · AS4
**Flow**
  1. **Triggered by incoming message** - [44010](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44010) — Deregistration request from the NB The MACO APP sends this message itself, as a follow-up process after this incoming message.
  2. **Load data for processing** - [Read balancing](/en/api/202610/backend-lesen/getaccountingbasic#bilanzierung-lesen) `GET /getAccountingBasic` Try it - [Read market location](/en/api/202610/backend-lesen/getmarketlocationbasic#marktlokation-lesen) `GET /getMarketLocationBasic` Try it - [Read grid usage contract](/en/api/202610/backend-lesen/getgridusagecontractbasic#netznutzungsvertrag-lesen) `GET /getGridUsageContractBasic` Try it
  3. Message to **NB** · AS4
    **Response per decision tree** - `44011`, `44012` → [E_3020](/en/referenz/202610/ebd/E_3020) · Check deregistration
  4. **Write endpoint** - Transaction updated — [Update process data](/en/api/202610/backend-schreiben-lf/updateprocessdata#prozessdaten-aktualiseren) `POST /updateProcessData` Try it out Updates the existing transaction in the backend once the message has been created.
### Response to registration This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [44003](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44003) — Rejection of registration · AS4 - [44002](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44002) — Confirmation of registration · AS4
**Response per decision tree** - `44003` → [E_3005](/en/referenz/202610/ebd/E_3005) · Check whether the registration can be rejected directly - `44003`, `44002` → [E_3007](/en/referenz/202610/ebd/E_3007) · Check start of supply
### Notification of the termination of the assignment
**Check identifiers** - [44037](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44037) — Information notification on termination of the assignment · AS4
**Flow**
  1. Message from **NB** · AS4
  2. **Load data for the incoming check** - [Read market location](/en/api/202610/backend-lesen/getmarketlocationbasic#marktlokation-lesen) `GET /getMarketLocationBasic` Try it
  3. **APERAK checks** - `44037` → `Z10` — APERAK check: Is location known ? - `44037` → `Z17` - `44037` → `Z18`
  4. **Write endpoint** - Transaction created — [Create process data](/en/api/202610/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.
### Information about the cancellation of a future assignment This step runs between other market partners and is not relevant for this view.
**Check identifiers** - [44038](/en/schnittstellen/202610/pruefi/UTILMD_GAS/PI_44038) — Information notification on revocation of a future assignment · AS4
Decision trees of this process | EBD | Name | |---|---| | [E_3020](/referenz/202610/ebd/E_3020) | Check deregistration | | [E_3005](/referenz/202610/ebd/E_3005) | Check whether the registration can be rejected directly | | [E_3007](/referenz/202610/ebd/E_3007) | Check start of supply |
## Process information
  1. ### Trigger **Runs beforehand:** [Billing data for grid usage settlement](/en/prozessdoku/202610/LF/GPKE-Teil2-abrechnungsdaten-netznutzungsabrechnung), [Determination of the MaLo ID of the market location](/en/prozessdoku/202610/LF/GPKE-Teil2-ermittlung-der-malo-id-der-marktlokation), [Creation](/en/prozessdoku/202610/LF/GPKE-Teil2-neuanlage) — these processes name the one shown here in their result.
  2. ### First message **NB** sends “Deregistration request” (Step 3). From here on, the party involved on this page takes its turn.
## 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 LFN](/en/prozessdoku/202610/LF--LFN/geli-gas-2-0-lieferbeginn) — the receiving supplier · market role LF - [View LFZ](/en/prozessdoku/202610/LF--LFZ/geli-gas-2-0-lieferbeginn) — future supplier · market role LF - [View NB](/en/prozessdoku/202610/NB/geli-gas-2-0-lieferbeginn) — 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. ::: 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: [3](#schritt-3), [4](#schritt-4), [6](#schritt-6)