The Supplier Portal for S/4 & ECC Customers - SAP Digital Supplier Network
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The SAP Digital Supplier Network is a new offering, specifically created for SAP S/4HANA (cloud & on-premise) and SAP ECC customers to connect their ERP directly to the world's largest Business to Business (B2B) Network. It is an entry-level, fixed-scope, best practice, and rapid deployment offering delivered by trusted SAP Partners. 
Learn more @ https://community.sap.com/topics/digital-supplier-network