Attachment transfer from PO to DSN - GOS / Business document

Hi,

SAP sends the GOS attachment from PO header to Ariba network along with the PO. This attachment is then available to the supplier on Ariba network for viewing.

Our customer uses GOS attachments to store internal documents and do not wish to share it with supplier. Is there a way to classify internal and external GOS attachments. Can we then through a BADI control which GOS documents are sent to the supplier

If instead of GOS, can customer choose to use Business documents storage (DMS) for their attachments. The Store Business document option is not active in Create PO mode, but only available after the PO is saved. This would mean that every PO would have to be changed after it is saved to upload an attachment. That would trigger a new PO output and a change PO output to the supplier.

Is there a better solution

Thanks

Venkat