Hi Vasilis
There are 2 indicators in Activity Master KL01 where you can define how you want to calculate your Plan and Actual Activity Price.
1. "Activity Price " Price indicator is for Plan and "Act Activity Price" for actual
if you define 1 in both the indicators then system will calculate :
....Plan price as per planning and KSPI to run
----- Act Price as per actual activity confirmation qty and KSII to run
The above is the ideal scenario
But you can manually put your plan and actual price where need not to do all above activities only define the indicator properly in KL01
In your case for actual define 7 in act price indicator then put value in KBK6 and run KON2 for revaluation
Kamal