need to develop vendor portal and intergrate it with SAP

SAP PI/PO Implementation & Vendor Portal Implementation and Its integration with SAP ECC 6.0. Development of a web portal in ASP.NET with SQL Server with following functional scope: Administration panel User creation and management Data import workbench Change password View own profile SAP Vendor master SAP Material master SAP Purchase orders Supplier panel View my purchase order Download Purchase Order (Excel) Print purchase order (pre-defined format) Update dispatch confirmation Purchase order report (own) Dispatch workflow Create barcode of ASN (Advanced Shipping Note) at supplier site Auto mail generation to the purchase team with purchase order and dispatched material details once the supplier updates the dispatch information Development of SAP functionalities (BAPIs, Reports, Function modules etc.) to interface with the web portal ( Portal panel ) : MRP Purchase order Purchase order details upon creation Purchase order details upon change (selected data) Vendor master information Material master information Vendor wise ASN Status Vendor wise GRN Status: Accepted/Rejected Gate Entry - Scan barcode SAP user creates GRN based on scanned barcode MIGO To create goods receipt, SAP user can use MIGO transaction SAP user can generate inward material document after material acceptance