What is background job name for Org chart buffering

Hi,

I was getting the error 'No Administrator Found for task ' while executing the workitem from my inbox yesterday . I refreshed the Org chart several times using the path setting->workflow setting -> refresh org chart and even executed the tcode SWU_OBUF several times .But same error was displaying.

But i executed the same workitem today without refreshing org chart and it is working fine.....I am not getting what was the problem.

From some of threads of forums i came to know that there is one background job running for refreshing the org chart.

Please can any one give the name of that background job.

Regards,

manju