How to configure sales agreement based discount

My client has a customer for whom condition record K007 discount needs to be created based on sales volume

- if the customer does up to Euro 199999 sales in a given period --> discount is 10%

- if the customer reaches or exceeds Euro 200000 - the discount will be --> 15% (from new orders, not all)

This is not simply to do with scales - because the scale will consider each individual order - this is based on total volume of sales target

So, whether he reaches the sales volume in one month or 9 months or 12 months, the new discount will start applying from the next order

(Not a rebate either)

Is there a standard SAP way of doing this condition record ?

(condition type K007 discount is being used for others also as % calc type)

Thanks,