Unable to Create Customer as Account Owner For External Bank Accounts using REST API

Summary:

Hi, I am trying to Create External Bank Account Owners using REST API for two Cases:

Case-1:

A new External Bank Account with intent as Customer by Submitting POST Request on below API:

API : fscmRestApi/resources/latest/externalBankAccounts

Request Payload :

{    "CountryCode": "GB",    "BankAccountNumber": "XXXXXXXX",    "BankBranchName": "Reston Town",    "BankName": "Citi",    "CurrencyCode": "USD",    "AllowInternationalPaymentIndicator": "Y",    "AccountType": "SAVINGS",    "Intent": "Customer",    "PartyId": XXXXXXXX,    "BankAccountName": "XXXXXX",    "accountOwners": [        {            "AccountOwnerPartyIdentifier": XXXXXXXX,            "Intent": "Customer"        }    ]}

Error: This combination of party and payment function is invalid based on the usage assignment of the party in Trading Community Architecture. (IBY-825839)

Case-2:

Adding Customer as Account Owner for Already Existing Bank Account, a Supplier is already added as Account Owner, Submitting POST Request On