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Integrating SAP with External Applications
Choose the interface from the business event, not from a preference for a protocol. A vendor portal reading a purchase order is often OData. A high-volume invoice posting may still be an IDoc. A bank file may remain SFTP because the bank specifies it. CPI is justified when you need operated monitoring across several partners. Write down what happens when SAP is down and who retries. That paragraph prevents a month of argument after go-live.