Verify bank account details for Electronic payment

Summary:

Hello,

We have a requirement to validate if bank account details are available for Invoices that needs to be paid as EFT. I am trying to create user defined validations with following conditions

1. Document payee bank account number = ‘Required’
2. Document payment method Equal to ‘EFT’. But this condition is failing as its defaulting to Number data type. How can I make the condition to select the document type as ‘EFT’.

I reviewed Oracle support document (How to Restrict Payment when Bank Account Details Are Missing (Doc ID 2844769.1)) , but it’s not letting me enter a character data type.

Please advise.