# GeLi_Gas 2.0 ch. 1.6.1 Inventory lists — LF view ## Process flow from the perspective of the LF \nSystem diagram: GeLi_Gas 2.0 Kap. 1.6.1 Bestandslisten — view of LF\n\n\nCustomer backend system\n\nMACO APP · LF\n\nMarket partner\n\n\n\n\nNB\n\nAS4\n44019, 44020, 44021\n\nLoad data for the incoming\ncheck\n\n\nMarktlokation lesen\n\nAPI\n\nAPERAK check: Z10, Z33\n\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\nPI 44019, 44021\n\nCreate transaction\n\n\nCreate process data\n\nAPI\nPI 44020\n\nLoad data for the check\n\n\n3 read APIs called\n\nAPI\nlisted at the step\n\nEBD check: E_BestListe\nBestandsliste prüfen\n\n\nLoad data for processing\n\n\n4 read APIs called\n\nAPI\nlisted at the step\n\nTrigger follow-up process:\n44020\n\n"} gesamt={"\nSequence diagram: GeLi_Gas 2.0 Kap. 1.6.1 Bestandslisten — view of LF\n\n\nBackend (customer)\n\n\nMACO APP · LF\n\n\nNB\n\n\n\nAS4 · PI 44019, 44020, 44021\n\nUpdate transaction\nUpdate process data · PI 44019, 44021\n\nCreate transaction\nCreate process data · PI 44020\n"} titel="LF" /> ## Process steps ### Inventory list of assigned market locations · Change notification for the inventory list · Response to change notification for the inventory list
**Check identifiers** - [44019](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44019) — Inventory list of assigned market locations · AS4 - [44020](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44020) — Change notification for the inventory list · AS4 - [44021](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44021) — Response to change notification for the inventory list · AS4
**Flow**
  1. Message from **NB** · AS4
  2. **Load data for the incoming check** - [Read market location](/en/api/202604/backend-lesen/getmarketlocationbasic#marktlokation-lesen) `GET /getMarketLocationBasic` Try it
  3. **APERAK checks** - `44019` → `Z10` — APERAK check: Is location known ? - `44021` → `Z33` — APERAK check: Is referenced message known ?
  4. **Write endpoint** - `44019`, `44021` → 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.
  5. **Write endpoint** - `44020` → 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.
  6. **Load data for the check** - [Read balancing](/en/api/202604/backend-lesen/getaccountingbasic#bilanzierung-lesen) `GET /getAccountingBasic` Try it - [Read energy supply contract](/en/api/202604/backend-lesen/getenergysupplycontractbasic#energieliefervertrag-lesen) `GET /getEnergySupplyContractBasic` Try it - [Read grid usage contract](/en/api/202604/backend-lesen/getgridusagecontractbasic#netznutzungsvertrag-lesen) `GET /getGridUsageContractBasic` Try it
  7. **Decision tree** - `44019` → `E_BestListe` — Check inventory list
  8. **Load data for processing** - [Read balancing](/en/api/202604/backend-lesen/getaccountingbasic#bilanzierung-lesen) `GET /getAccountingBasic` Try it - [Read energy supply contract](/en/api/202604/backend-lesen/getenergysupplycontractbasic#energieliefervertrag-lesen) `GET /getEnergySupplyContractBasic` Try it - [Read market location](/en/api/202604/backend-lesen/getmarketlocationbasic#marktlokation-lesen) `GET /getMarketLocationBasic` Try it - [Read grid usage contract](/en/api/202604/backend-lesen/getgridusagecontractbasic#netznutzungsvertrag-lesen) `GET /getGridUsageContractBasic` Try it
  9. **Trigger follow-up process** - [44020](/en/schnittstellen/202604/pruefi/UTILMD_GAS/PI_44020) — Change notification for the inventory list After processing, the MACO APP starts this follow-up process itself.
## Process information
  1. ### First message **NB** sends “” (the first step). From here on, it is the turn of the party involved on this page.
## 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/geli-gas-2-0-geli-gas-2-0-kap-1-6-1-bestandslisten) — 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. ::: The source does not name this step; the heading names the use cases of its messages. Applies to: [—](#schritt-ohne-nr-0) 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: [—](#schritt-ohne-nr-0)