Solution : https://service.sap.com/sap/support/notes/588224 (SAP Service marketplace login required)
Key words :
-cumulative time-reference characteristic, 0b import support package 08, 1c import support package 02, time-reference characteristic, -cumulative key figures, 0b support package 08, 1c support package 02, bw support packages, support package, 0b patch 08