Hi ,
Can you Please save that report as variant for User ID AAA . ( Both for selection screen and output ) Please create Gloabl Variant so all user Can run . Now Please run the same Variant in that report with User ID BB and now check wether its same or not .
one more thing if this Cost centre report then Please check RPC0 and go to REPORT CURRENCY TAB . Please comapre the settings for report .
IF your are running any financr report then please check whether you have currency translation option which may ne one user has active and another not .
Many Thanks