OM Order Line CUSTOM workflow R12, Fnd_Global.APPS_INITIALIZE does not work.

Hello

I am trying to upgrade our Order Managment CUSTOM workflow to R12.

In 11i, I force the workflow to submit a concurrent program under the user name, responsibility who has created the sales order by using

Fnd_Global.APPS_INITIALIZE (l_user, l_responsibility, l_application);

This is working perfectly in 11i but NOT in R12.

Instead, in R12, the workflow is submitting the concurrent program under the user who is running Workflow background process.

Any idea on how I can do the same in R12?

Thanks for your help

Emeline