Page "Register Customer Payments" lacks the following fields:
1. Currency Code - it would be beneficial to see the currency code, that comes from the Posted Sales Invoice, otherwise the users receive the following error on posting. Moreover, this information is visible in Apply Customer Entries, when the application is done from any other journal. Otherwise the Accountant using Payment Registration is not aware about the Posted Sales Invoice currency code.

Error message : The document with type Invoice and description Sales Prepayment, Order P-000318. must have the same currency code as the payment you are registering.

2. External document No. - this should come also from Posted Sales Invoice, because this information is visible in Apply Customer Entries, when the application is done from any other journal.