Rapid mart job was scheduled by Unknown user

Hi Friends,

As a process of job monitoring I found a rapid mart job was executed  as per schedule. Once the job is started  after few hours I found  the  above errors.

836:4476) R3C-150605: |Data flow DF_Fact_SAP

                                                     The SAP job was canceled for host <>, job name <R3_ServiceFact 06/28/12 08:>, job count <08282600>, job log from SAP <  

                                                     28.06.2012   08:28:27    Job started

                                                     28.06.2012   08:28:27    Step 001 started (program ZW83602279, variant &0000000000000, user ID BIUSER)

                                                     28.06.2012   11:07:46    Internal session terminated with a runtime error (see ST22)

                                                     28.06.2012   11:07:46    Job cancelled

My question is we do not have any user called '' BIUSER '' configured in Data services Management console.So, How it was executed by that name

Secondly  I found correct name in logs as job was initited by '' user'' . But in error logs it is showing different user

Thanks in advance

Regards

Fasi