How to update SAP BPM started by field with correct initiator

Hi,

We came accross a strange issue in BPM. We have developed a BPM application with WDJ having front end. when the portal user (REQ_USR) initiates the request, BPM initiates properly but when we see in the bpm in nwa -> manage processes the process started by is not updating properly. Kindly see the screenshot, in our case we expected the started by as "REQ_USR" instead of "YCPIC_SYNDAR". Can somebody help what needs to be done to update it with correct user.

Thanks,

Pradeep