Thanks Ravi, , you are right
I have 2nd question
I have business process
• Business Objective 1: No more Carrier invoices detailed check to be done by Sales Administration Department by subcontracting this business to an external company like CP(3rd party) and by using automatic files transfer out (delivery note) and in (Carrier invoices)
I know there is a interface at 2 stages I need to know how should I start writing functional spec for, At the moment all the work is done by local sales admin staff. so where I should start on this as I am new to SD