If we have a bank document in the same currency as an invoice, we can match them in the Bank (or Cash Register) module. Here we find the required payment, click the "dots" icon, and select "Pay Document".
We now select the invoice we want to match the payment with:
If we want to match a bank payment with multiple invoices, we can use the checkboxes to select several documents at once.
If we want to unmatch a payment from an invoice, we click the "dots" icon again and select "Cancel Payment":
To find out which invoice a payment is linked to, we can again click "Show Links" in the More Actions menu, where the linked documents will be displayed:





