How to set user responsible of changing operation status

Hi all,

I publish a web service from my application.

A generic user is defined for the webservice authentication.

This webservice allows the consummer to change  the operation status. the abap code is using fm  CO_RI_CONFIRMATION_CREATE to achieve it.

My request is that the uname in JCDS is the generic user (sy-uname) and not the real user id.

I can receive the real user id in my webservice data, but how can I save it in JCDS ?

Thx all.