When retrieving trade agreements (+ discounts and charges) for sales orders, it would be beneficial if the Date type used could be defined not only in the AR parameters, but also on Customer level. 

That way, customers with contractual price calculation exceptions can be addressed by configuring specific date types on the customer master. If no date type is configured on the customer, then the AR parameter is applied.  

This idea comes from a discussion regarding the new Pricing management functionality for SCM.