Hi Marcel ,
For the detailed instructions to download and install the transport files, configure Ariba, and configure SAP, see the Ariba Procurement Solutions Integration Guide for SAP Ariba Procure-to-Order Ariba Procure-to-Pay Release 12s (AribaProcurementSolutionsIntegrationGuide for SAP).
Users of Cloud Integration versions can see the Ariba Procurement Solution Integration Guide for SAP ERP Ariba Procure-to-Order Ariba Procure-to-Pay (Ariba Procurement Solution Integration Guide for SAP ERP) for equalivent information
Regards
Vignesh.S