Hi Cleo,
As pointed out by svu, pleae recheck your master data for object costelement. if loads are happening properly then check whether data was activated by Acttribute change run(ACR) or not. if you maintained master data then ACR may be missed. Please run ACR and later check the bex report level. if properties choose as Key and Text then you can those at bex level.
to run ACR use program SE38 - RSDDS_AGGREGATES_MAINTAIN, pass respective info object.
Thanks