Payment wizard - copy exchange rate from invoice

Dear Experts,

I'm facing a functional issue with the payment wizard.

my customer runs some (import) purchasing processes with fixed exchange rate from purchase order to outgoing payments.

As a result, he does not want to get any posting for exchange rate difference in the outgoing payments.

Generating the outgoing payment with the payment wizard, SBO uses the exchange rate of the day.

Is there a way to copy the exchange rate from the A/P invoice, or at least to change it somehow ?

the use of the outgoing payment transaction for manual payment enables to change the exchange rate.

But my customer needs to use the payment wizard in order to be able to generate the bank files.

Do you have any suggestion ?

waiting for your feedback

Regis