SNC PO collaboration

Hi Gurus

I need some insight on below requirements if any one has worked on same

1) Need a functionality in SNC to attach a document in ASN for PO on SNC ( I know SAP has come up with attachment in PO recently and now with version 7.12 you can attach documents in PO header & item)

But my requirement is to attach document during ASN creation for a PO in SNC

2) Need a functionality to display Item pricing conditions on SNC PO

3) Need a functionality to update GR accepted or rejected Qty updates in ASN (with POD from ECC only GR Qty is updated)

Please let me know if anyone has comments on how I can do above in SNC, that will be great help ! (I know all above not possible in Standard SNC)

Thanks

Vipin