Solution : https://service.sap.com/sap/support/notes/555217 (SAP Service marketplace login required)
Key words :
calculated key figure reason, solution import support package 06, 'calculated key figure', 'basic key figure', bex query designer, bw support packages, cl_rsr_lfmm=>get_chanmid method, 0b support package 06, exception aggregation' properties, support package