Performance Reporting - Missing Data

Hi experts,

in IT-Performance Report (Work Center Technical Monitoring->Interactive Reporting) I miss some data since a few days.

I can see for example a "30 days" analysis, but not a "24 hours" analysis.

The Error means "Data Quality".

Therefore I go to WC Solution Manager Administration->Infrastructure->BW Reporting->System Reporting->Self Checks

And here I can see at the system which is affected the following error:
System <sid>: Overrun for ABAP stat. data; protection active (Aggregate )

So at the moment I don't really know, if this is the cause or not, that I can't see the 24hours-analysis.

But I also don't understand how I can " deactivate the reaggregation".

Can anybody please help me, thank you