Field help (SCOFCY) 

Code of the site issuing the order (request for quote, purchase request, order, subcontract order etc.).
This field is mandatory. It is initialized by default by the purchase site associated with your function profile.
You can modify this code by selecting a code from the list of authorized sites.

There is no requirement for the order site to be a storage site. When it is a storage site, it loads, by default, the receiving site of the ordered subcontracted products as well as the storage site of the materials to be shipped to the subcontractor.