SAP Standard jobs are cancelled

Hi,

In one of BI (Netweaver 2004s) boxes SAP standard jobs are being canceled , for example sap_ccms_moni_batch_dp background job which runs hourly is being canceled at times and being finished successfully at other times.

Job log says "you can only work in client 001".

Plz let me know what could be the possible reason?

Thanks in advance..

Regards,

Dinakar