And what about next period value for KPI1021? It will be incorrect!
Sample:
You have already data in 2016.02, 2016.03 and 2016.04 for KPI10406 and result in KPI1021
You change value in KPI10406 for 2016.03 and the correct value will be saved in KPI1021 for 2016.03
But KPI1021 for 2016.03 will be incorrect!