Thanks for replying. 
The problem is that different products have different prices and it would be a lot work to set a pricing rule for 160 products. I think that a python script is the only way forward. Perhaps you can help me with my other issue:
Thanks for replying.
The problem is that different products have different prices and it would be a lot work to set a pricing rule for 160 products. I think that a python script is the only way forward. Perhaps you can help me with my other issue: