ISO 20022 · External code set

Underlying trade transaction type codes

Specifies the external commercial reference type code in the format of a character string with a maximum length of 4 characters. The list of valid codes is an external code list published separately. External code sets can be downloaded from www.iso20022.org.

7 registered codesSource release: August 2026 (v3)

Registered codes in `ExternalUnderlyingTradeTransactionType1Code`. Select a code for its full definition and source details.
Code	Published name and definition
`CONT`	Contract Underlying transaction is a contract.
`DELV`	Delivery Order Underlying transaction is a delivery order.
`PROF`	Proforma Invoice Underlying transaction is a proforma invoice.
`PROJ`	Project Underlying transaction is a project.
`PUOR`	Purchase Order Underlying transaction is a purchase order.
`QUOT`	Quotation Underlying transaction is a quotation.
`TEND`	Tender Underlying transaction is a tender.

Message references 4

Versions listed in the source workbook, including older versions. This list does not establish which messages a bank, network or provider supports.

tsrv.003.001.01Undertaking Issuance Notification V01
tsrv.002.001.01Undertaking Issuance Advice V01
tsin.005.001.01Undertaking Application V01
tsrv.001.001.01Undertaking Issuance V01

Source: UsageInMsgs sheet in 2Q2026_externalcodesets_v3.xlsx.