I have created coupon and I used it as automatic one. It works but there is no possibility to use any other coupon. At the checkout I can of course put another coupon code and the name I see is changed but the value remain the same as the automatic one.
coupon-20 gives discount 20% and it is set as automatic.
coupon-10 is a regular coupon for specific value (for example 10 Euro)
At the checkout I can see coupon-20 which gives 20 Euro discount out of 100 Euro (100-20=80)
I put new code coupon-10. I can see in basket proper coupon name (coupon-10) but the end value is still 80 instead of 90.
I use Rupostel OPC :-)