Hello Andrea,
It helps with these kind of issues. I had faced similar issue in the past (3-4 years back) while adding a new Keyfigure in the DP Planning Area. As a reply to OSS message, I was advised to run /SAPAPO/TS_LCM_REORG.
This program helps in Detection and correction of time series master data inconsistencies. It should be executed only in case of serious problems with time series data in liveCache. For better performance and to make a safer run, while the report is running other applications must not access liveCache data, so the runtime should be kept as short as possible.
Good Luck...!
Hope this will help.
Thank you
Satish Waghmare