Foreign currency customer has fully paid up, in home currency balance remains

‘Hi’ to the community!

I face the following issue: a customer who is billed in foreign currency has paid up fully (in that foreign currency), hence the outstanding balance is nil in foreign currency. In the ‘Payment tool’ there are no unpaid invoices listed. So far so good. However, in A/R a minuscule difference remains in home currency.

How can I write off the difference or set EUR0.00 (actual balance in foreign currency) to USD0.00 (home currency)?

Many thanks for any suggestions.

Best regards