As I told you in my previous posts I have diged a little into SAP Workflows and now I briefly understand them. For anyone who's interested in the subject I have discover this 2 site of Alan Rickayzen, the author of Practical Workflow for SAP:
(tutorial about how to create a workflow in SAP)
(good FAQs about workflows.)
Other SAP Workflow article:
Why use SAP Workflows
And by the way. I managed to creeate my first SAP workflow from scrach.