Update Notification task user status

Hello ,

we are migrating data from legacy to SAP.

We are creating Notification from custom program in background .

Now requirement is to set the user status to Notification task, but problem is default status profile cannot be set to notification task .

Client want to assign status profile dynamically and update user status for notification task.

i debugged standard program and check that it uses FM "STATUS_UPDATE" .

with the same FM it work on debugging mode but when i try to run in background status profile nor user status is updated.

anyone have idea what is the problem