ZagTrader

ExternalPaymentModificationRejection1Code

UM18 Code: Unable To Modify Instruction For Next Agent

Written and maintained by ZagTrader. Last reviewed . How this page is sourced and checked

UM18 means unable to modify instruction for next agent in the ISO 20022 payment modification rejection code set. Instruction for next agent cannot be modified (former UnableToModifySenderToReceiver).

Code
UM18
ISO name
UnableToModifyInstructionForNextAgent
Status
Registered
Last updated
2018-05-01

Official definition

Instruction for next agent cannot be modified (former UnableToModifySenderToReceiver).

Definition from the ISO 20022 External Code Sets, 2Q2026 (published 28 Aug 2026).

Messages and fields that use ExternalPaymentModificationRejection1Code

MessageElement path
camt.029Sts/RjctdMod/Cd, ModDtls/ModStsRsnInf/Rsn/Cd

UM18 questions

What does UM18 mean in ISO 20022?
UM18 is Unable To Modify Instruction For Next Agent in the ExternalPaymentModificationRejection1Code code set: Instruction for next agent cannot be modified (former UnableToModifySenderToReceiver).
Where does UM18 appear in a message?
For example in camt.029, element Sts/RjctdMod/Cd.

All ExternalPaymentModificationRejection1Code codes · ISO 20022 code sets

The ISO 20022 code names and definitions on this page are reproduced from material published at iso20022.org under the ISO 20022 Intellectual Property Rights policy. This is not the official source: the up-to-date ISO 20022 standards and repository material are published only at iso20022.org. Explanations in our own words are by ZagTrader. ZagTrader is not affiliated with or endorsed by ISO or Swift.