Update of project planning after change in activity type

Hello Experts,

we are doing manual activity input planning ( CJ40 ) via customer report per year equal to project dates.

This means if we change activity plan price ( KP26 ) in future years, we need to recalculate the planned values in project system.

If we manually change values in CJ40 after changes in KP26 the system calculates the new monetary value in background

Example: Planned on project 10 Hrs a 20€ = 200€ // change price of activity type to 30€ // Plan 1 additional hour in CJ40: Monetary value changes to 11 Hrs a30€ = 330€ and posts +1 Hr with +130€ price difference.

Is there a opinion to adjust/update the monetary value after changes in KP26 without changing plan values?

Thanks