Foreign currency invoice - unable to match payment

Foreign currency invoice - unable to match payment

My base currency is AUD and I have issued an invoice in CHF. The invoice has been paid and hit my bank account in AUD with the bank having converted the incoming CHF payment. There are two issues:
  1. In banking, I cannot match the bank transaction to the open invoice. No matter how I change the filter, the invoice just doesnt show up.
  2. Doing a "categorize manually" > "customer payment", the open invoice shows up. But I put in the bank charges and select the invoice, choosing full payment, I am then left to edit the exchange rate to make the CHF amount match the invoice amount (after bank fees). As the sum is quite large, I cant edit the rate sufficiently enough for the two amounts to match (I enter the exchange rate to 15 digits after the decimal, and the whole thing is still CHF 0.12 out after that)

Please tell me either what I am doing wrong or allow for the "amount" to be edited.

I cant use ZOHO books unless that gets fixed.