How can i match two or more invoices with one payment in external payments?

In external payments I have loaded a CAMT053 fil and I would like to match one payment with two or more invoices. How can I do that? 
 

Here is an fictitious example:
The company has received a customer payment at 267,750 DKK. This payment is payment for two customer invoices. How can we match the payment with two invoices in External Payment Details and not only with one? As you can see we only can match one invoice at the linie. 
 

Please let me know what you are doing to match one Customer- or Supplier payment with two or more invoices in External Payment Details. 


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