Non-Participant in IAT Program
Category: International (IAT) Initiated by: Gateway / RDFI
Applies to (SEC scope)
OUTBOUND IAT
camt.053 mapping
BE06 — Unknown End Customer
Reinitiation
Not applicable to this code
Nacha's definition
The IAT Entry is being returned because the Gateway does not have an agreement with either the ODFI or the Gateway's customer to transmit Outbound IAT Entries.
Verbatim from Nacha — ISO 20022 Guide to Mapping U.S. ACH Return Items and Notifications of Change, August 2023, Version 2.01 (Table 1, return reason codes) (return reason code table). Applies to: OUTBOUND IAT.
How it appears in an ISO 20022 statement
Nacha's mapping guide maps R81 to camt.053 reason code BE06 (Unknown End Customer) — ISO definition: End customer specified is not known at associated Sort/National Bank Code or does no longer exist in the books
Return time frame
IAT and Gateway returns run to the time frames in the Nacha Operating Rules, which are not stated in the public sources used here.
Can the entry be reinitiated?
Nacha's reinitiation rule governs resubmission of returned debit entries; it does not arise for this code. See the definition and the operator note for what the return means and who acts on it.
What an operator does next
The Gateway has no agreement covering this outbound IAT. A relationship problem, not a data one — route through a Gateway that has one.
PaymentBrief guidance, not Nacha text. Your ODFI's procedures and the current Nacha Operating Rules govern.
Where this comes up on PaymentBrief
Sources for this code
- Nacha — ISO 20022 Guide to Mapping U.S. ACH Return Items and Notifications of Change, August 2023, Version 2.01 (Table 1, return reason codes) — nacha-mapping-guide, retrieved 2026-09-06
- Nacha — rule page 'ACH Network Risk and Enforcement Topics' (unauthorized return rate threshold; reinitiation of entries) — nacha-rule-page, retrieved 2026-09-06
- Federal Reserve Financial Services — FedGlobal ACH Payments Origination Manual, 3 August 2026 (return item code tables) — ach-operator-manual, retrieved 2026-09-06