Ariba Service entry sheet gets interfaced and remains on n composing

I am trying to explore Ariba SES functionality. The issue which i am facing is:

When i create a SES as a vendor it reaches B&I and remains in composing state. Who is suppose to submit this composing SES? I can see in approval flow requester is added which is in pending state(as SES is in composing) . As a requester I don’t see submit button on the composing SES.
Should not be SES when interfaced from network to B&I go directly in submitted state?