In some cases, Nexus requires additional information, so elements which are defined as optional in CPMI or CBPR+ usage guidelines are mandatory in Nexus. These are specified in the table below:
There are also the following notable differences against CBPR+:
Nexus uses the latest version of the ISO 20022 message (pacs.008.001.11) while CBPR+ uses an older version (pacs.008.001.08)
Group Header Changes:
The Settlement Method of Nexus is defined as CLRG, but this value is removed from CPBR+ as not relevant.
Transaction Level Changes:
Service Level is limited to three repetitions in CBPR+, while this is limited to 1 in Nexus
CBPR+ has additional rules on the filling of postal address fields, (in line with CPMI recommendations) to maximise the granularity of postal address details. Nexus strongly recommends this approach but does not yet make it mandatory, meaning that Nexus will not reject a message that uses Address Line fields over dedicated StreetName, TownName, PostalCode elements.
ELEMENT
STATUS IN CPMI
STATUS IN CBPR+
STATUS IN NEXUS
NOTES
Acceptance Date Time (AccptncDtTm)
Does not stipulate usage
Optional
Mandatory
Defines the point in time when the payment order from the initiating party meets the processing conditions of the account servicing agent. Required for Timeout and SLA management.
Clearing System (GrpHdr/SttlmInf/ClrSys)
Optional
Optional
Mandatory
This is required to identify the domestic instant payment system operator. This is updated by Nexus to reflect the Destination IPS before the payment is sent to the Destination IPS.
Intermediary Agent 1 and 2 (IntrmyAgt1 and IntrmyAgt2)
Optional
Optional
Mandatory
These are required in Nexus to identify the Settlement Account Providers at which the FXP holds funds in both currencies.
Instruction Identification
Optional
Mandatory
Optional
UETR is the primary instruction identification used in Nexus. Instruction Identification is therefore optional.
Instructed Amount (InstdAmt)
Mandatory
Optional
Mandatory
Mandatory in line with CPMI recommendations.
Debtor Account (DbtrAcct)
Recommended
Optional
Mandatory
The Debtor Account is used to identify the account of the Debtor (Sender). This is recommended but not mandatory in CPMI, but mandatory in Nexus.
Creditor Account (CdtrAcct)
Recommended
Optional
Mandatory
The Creditor Account is used to identify the account of the Creditor. This is recommended but not mandatory in CPMI, but mandatory in Nexus.
Remittance Information (RmtInf)
Optional
Optional
Conditional Mandatory
Mandatory only in case the Source PSP uses an FXP for the currency exchange. The sub-element Additional Remittance Information (AddtlRmtInf) is mandatory (if the above condition applies) and contains the Nexus FX Quote ID, which is required for validating the FX Quote.
Exchange Rate (XchgRate)
Does not stipulate usage
Optional
Mandatory
Required to convert the amount from Source currency to Destination currency
Previous Instructing Agent 1 and 2 (PrvsInstgAgt1 and PrvsInstgAgt2)
Optional
Optional
Mandatory (on Destination leg)
These are required in Nexus to identify the Settlement Account Providers at which the FXP holds funds in both currencies.