Document Attachments in Shopping Cart

HI,

Can any one tell me, when an document is attached in shopping cart where it will save and how this configuration has be made. If I want to change the settings to save in another server say filenet. How can I change, do I need to use any BADI (If exists please let me know in detail) or I need to change the settings.

Actually as per the user - when a shopping cart is created with an attachment it is storing in two places one is in ebp/docserver and another is in Filenet server. Now they want all the attachments only to be stored in Filent server.

Regards

Ram