Prevent promo discount when there is already a per order disount

[Michael Brohl]

Hi everyone,

is there an out-of-the-box solution for the following promotion scenario:
Prevent a per product or product category promotion if there is already 
a per order promotion active.

So if there is already an order percent or flat amount discount, any 
other (additional) promotions should be discarded and the user should be 
informed that those promotions cannot be combined.

Any hints?

Thanks and regards,

Michael