BW Statistics - no automatically deletion of loaded statistical data

Dear colleagues,

we're loading the query statistics data in the technical content (InfoCube 0TCT_C01 - 0TCT_C03) as using the technical Content (recommended in BW-Documentation https://help.sap.com/saphelp_nw73/helpdata/en/43/e37f8a6df402d3e10000000a1553f7/frameset.htm ).

But it don't cause automatic deletion and regular deletion of data from the BW statistics tables. Parameter TCT_KEEP_OLAP_DM_DATA_N_DAYS is not set in table RSADMIN.

Why are data from the BW statisics tables not deleted automatically after upload in InfoCubes?

I know that I can delete data manually, but it should work automatically.

Thanks for Support.😊