Not specified — agent-generated
Category: Debtor Refusal & Unspecified R-type: Reject / Return
SCT
N/A
SCT Inst
N/A
SDD Core
Applies
SDD B2B
Applies
Retryable
No, until verified
Generated by
Debtor bank, withholding the underlying reason.
ISO 20022 definition
Reason has not been specified by agent.
Typical cause
The single highest-ambiguity SEPA code. Three distinct causes: (1) data-protection substitution — EPC guidance (EPC173-14, stable v4.0–v8.0) requires MS03 in place of AC04, AM04, MD07, RR01, RR02, RR03, or RR04 where national law blocks disclosure, in Austria, Belgium, Germany, Luxembourg, the Netherlands, Slovakia, Slovenia, and Switzerland; (2) bank-side risk control flagging beyond any specific code; (3) a genuine unspecified/catch-all error.
What to do about it
Do not retry without investigation. Treat as you would AC04 on first occurrence — check with the customer whether the account is active and update mandate status if confirmed closed. If the debtor is unreachable, or if prior collections on the same mandate failed with AM04 or AC04, treat repeat MS03 as a likely closed/blocked account and pause collections rather than retry.
When the debtor bank is in one of the eight countries above, MS03 is most commonly a masked AC04 (closed account) or AM04 (insufficient funds) rather than a genuine unspecified error.
Full reference
SEPA Return and Reject Codes: The R-Transaction Reference