Invoice not appearing in payment form

Summary:

Hi Team,

There is one USD ledger whose base currency is USD. User has already paid offline via bank account from SGD currency bank account.
Now when user is trying to do payment in Oracle, invoice is not appearing in payment form.
We cannot even enable MultiCurrency on bank account level because ledger currency is USD and bank account currency is SGD. Can you let us how can user make the payment via SGD bank account or any other alternate workaround

Thanks,
Araf Shaikh

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):