Using Staged Billing and Payment Schedule in combination with Payment Terms

Hi, 

I want to use Staged Billing for Customer Orders and Payment Schedule for Purchase Orders, but I ran into a problem with the cashflow forecast. For example:

I have a Customer Order with one line with a total of €10.000. It is divided into 3 installments:

1. 10%, with a payment term of 5 days
2. 60% with a  payment term of 30 days
3. 30% with a payment term of 60 days

See below the Staged Billing. 

But when I generate the cashflow forecast, IFS makes the forecast based on the Expected Approval Date (as seen above, this is correct) plus the Payment Terms on the Customer Order. But the Payment Terms is 60 days, which is standard for this customer. So it will not consider the different payment terms per stage. 

Is it possible to combine the Staged Billing with differt payment terms per stage?