Customer would like to have the possibility of automatic settlement between the customer invoice and the prepayment,

Users have to manually settle the customer invoice with the prepayment in the customer transactions form. This is time consuming.

Repro Steps:-
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1) Made a SO for 900.
2) Made a customer payment journal 900.
3) Filled the payment reference section with the SO number and set the Prepayment journal voucher to yes.
4) Posted the Payment journal.
5) Reviewed the SO >> Pre-payment... The amount is 0.00.
6) Invoiced the SO.

Current output:-
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Invoice and Payment are not settled.

Expected output:-
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Invoice and payment should be settled.