Payment behavior configure customer payment term wise.

I got new business requirement

As per business requirement they want to calculate payment behivaour as per customer payment terms.

E.g. If my credit exposure used only 50% and my next shipment is only for 20% of the remanding credit exposure but my one payment document is overdue. as per customer payment term. how the delivery will stuck due to this overdue.

Also suggest how to configure customer payment term wise payment behavior key figure in oldest open item.

Please suggest the solution.