Is your feature request related to a problem? Please describe.

At the moment we can only match a Bank Transaction to vouchers in the same currency: either voucher currency or party account currency must match. However, it can also happen that a voucher in currency A is paid in some arbitrary other currency B. This case is currently not supported.

Describe the solution you'd like

We cannot readily know how much of the outstanding amount is paid by the Bank Transaction, since it's in a completely different currency. But we could easily allow to mark a voucher as fully paid for by the bank amount.

• Add a checkbox Cross-Currency in the Bank Reconciliation Tool's Match Voucher tab. If this is enabled, show only vouchers with different currencies than usual (invert the currency condition in SQL queries).
• As soon as a single vouchers is selected, show the full bank amount as Allocated Amount and 0.00 as To Allocate.
• Before clicking reconcile, show a warning stating that the payment in B will offset the entire outstanding in A.
• Ensure that payment entries are created correctly in he backend.

This principle can also work when reconciling multiple vouchers at once. In this case we create a Journal Entry (as usual) and use the bank amount to offset the outstanding from each selected voucher.

Describe alternatives you've considered

• Instead of fully reconciling the voucher, we could also prompt the user to enter how much (in the voucher's currency) should be reconciled.
• We could also use the payment day's exchange rate to determine the corresponding amount in the voucher's currency.

Additional context

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