# Exchange of the supplier substitute energy clearing list — LF view On the basis of the market locations assigned to the LF-AASZR, the NB creates the LF-AACL and sends it to the LF. The LF has the option of plausibility-checking the LF-AASZR against the data of the LF-AACL. An LF-AACL is created for every LF-AASZR and can also be requested separately. Where applicable, the NB has the response message of the LF on the LF-AACL that was sent. ## Process flow from the perspective of the LF \nSystem diagram: Austausch der Lieferantenausfallarbeitsclearingliste — view of LF\n\n\nCustomer backend system\n\nMACO APP · LF\n\nMarket partner\n\n\n\n1. LF-AACL\n\nNB\n\nAS4\n55201\n\nAPERAK check: Z33\n\n\nCreate transaction\n\n\nCreate process data\n\nAPI\n\nTrigger follow-up process:\n55201\n\n\n2. Rückmeldung zur LF-AACL\n\n\nNB\n\nAS4\n55202\n\nUpdate transaction\n\n\nUpdate process data\n\nAPI\n"} gesamt={"\nSequence diagram: Austausch der Lieferantenausfallarbeitsclearingliste — view of LF\n\n\nBackend (customer)\n\n\nMACO APP · LF\n\n\nNB\n\n\n1. LF-AACL\nAS4 · PI 55201\n\nCreate transaction\nCreate process data\n\n2. Rückmeldung zur LF-AACL\nAS4 · PI 55202 · E_0096, E_0097\nE_0096 — Marktlokationen mit LF-AACL abgleichen\nE_0097 — Marktlokationen mit LF-AACL abgleichen\n\nUpdate transaction\nUpdate process data\n"} titel="LF" /> ## Process steps ### LF-AACL
**Check identifiers** - [55201](/en/schnittstellen/202604/pruefi/UTILMD/PI_55201) — LF-AACL · AS4
**Flow**
  1. Message from **NB** · AS4
  2. **APERAK checks** - `55201` → `Z33` — APERAK check: Is referenced message known ?
  3. **Write endpoint** - 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. **Trigger follow-up process** - [55201](/en/schnittstellen/202604/pruefi/UTILMD/PI_55201) — LF-AACL After processing, the MACO APP starts this follow-up process itself.
### Response message on the LF-AACL
**Check identifiers** - [55202](/en/schnittstellen/202604/pruefi/UTILMD/PI_55202) — Correction list LF-AACL · AS4
**Flow**
  1. Message to **NB** · AS4
    **Response per decision tree** - `55202` → [E_0097](/en/referenz/202604/ebd/E_0097) · LF · Reconcile market locations with LF-AACL - `55202` → [E_0096](/en/referenz/202604/ebd/E_0096) · LF · Reconcile market locations with LF-AACL
  2. **Write endpoint** - 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 once the message has been created.
Decision trees of this process | EBD | Name | |---|---| | [E_0096](/referenz/202604/ebd/E_0096) | Reconcile market locations with LF-AACL | | [E_0097](/referenz/202604/ebd/E_0097) | Reconcile market locations with LF-AACL |
## Process information Wording of the consolidated version, profile ch. 17.3.2.6.1, p. 245.
  1. ### Preconditions - The LF has the LF-AASZR from the NB. - The LF knows the MaBiS-ZP of the LF-AASZR.
  2. ### First message **NB** sends “LF-AACL” (step 1). From here on, the party involved on this page has the next move.
  3. ### Objective The LF has the requested supplier substitute energy clearing list (LF-AACL). If the LF-AACL has been subscribed to, the LF is registered with the NB as a subscriber of the LF-AACL.
## 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/MaBiS-austausch-der-lieferantenausfallarbeitsclearingliste) — 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.* 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)