Comprehensive and Detailed Explanation

To call on-premise systems (e.g., ECC, on-prem S/4HANA, custom OData services), CAP requires:

D – Cloud Connector

The Cloud Connector creates asecure tunnelbetween SAP BTP and the on-prem network.

It maps internal systems and resources (paths, ports) to virtual on-demand resources that BTP can access.

Without Cloud Connector, BTP services cannot reach the on-prem landscape.

B – Destination Service

CAP applications rely onDestinationsto configure:

Hostnames and URLs

Proxy types (onPremise)

Authentication mechanisms

SAP Cloud Connector location IDs

System routing metadata

Outbound CAP service calls use destination configuration to find the on-premise endpoint.

Why the Other Options Are Incorrect:

A – API Management:

Useful for external API governance but not mandatory for on-premise connectivity.

C – Event Mesh:

Used for event-driven communication, not direct connectivity to legacy/on-prem services.