When PP3 is enabled, customer is not able to update only Compensation Information using MSS. They always get Job Information section as well along with Compensation Information.
Employee Central: PP3
The Product Management team has classified this as an enhancement request. There is a workaround to edit only the Compensation Information by navigating to the Compensation Information block and editing there. They are considering to implement the enhancement in b1705, however they have not commited it yet. The enhancement request can be tracked in ECT-59370.
ECT-59370 , KBA , LOD-SF-EC-PP3 , People Profile (PP3) , LOD-SF-EC , Employee Central , Product Enhancement