The ABAP Cloud development model enforces a strict "public interface" contract. Only SAP objects (like classes, interfaces, CDS views, etc.) that are explicitly released for cloud development can be used in custom code. This rule is enforced at the earliest possible stage: the syntax check. When a developer tries to reference an object that is not part of the released public API, the ABAP compiler in the ABAP Development Tools (ADT) will immediately raise a syntax error, preventing the code from being activated. This ensures that all custom code is compliant, upgrade-stable, and adheres to the cloud development paradigm.

A. It compiles, but ATC warns only during transport: This is incorrect. The check is a fundamental compiler rule, not a post-development quality check. The code will not compile or activate, so it cannot reach the transport stage.

C. It works if you add the package as a friend in the interface: This is incorrect. The "friend" relationship in ABAP Objects is for granting access to private/protected components and does not override the fundamental API release and visibility rules of the ABAP Cloud model.

D. It runs but raises CXNOAUTHORITY at first call: This is incorrect. The issue is a compile-time violation, not a runtime authorization failure. The code would never be in a runnable state to trigger any exception.

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1. SAP Help Portal - ABAP RESTful Application Programming Model: In the "ABAP Language Versions" documentation

it is specified for the ABAP for Cloud Development version: "A restricted syntax is used... A restricted set of repository objects from SAP can be used... The use of a non-released API of an SAP object produces a syntax error."

Source: SAP Help Portal

ABAP Keyword Documentation

section on ABAP Language Versions.

2. SAP Help Portal - Released APIs: "In ABAP Cloud

you can only use released SAP APIs in your custom code. The ABAP compiler checks whether you only use released SAP APIs. If you use an unreleased SAP API

you get a syntax error."

Source: SAP Help Portal

ABAP Platform

section on Development in ABAP Cloud -> Released APIs.

3. openSAP Course - Building Apps with the ABAP RESTful Application Programming Model (RAP): Week 1

Unit 3

"Getting Started with ABAP Development Tools

" explains that the ADT environment enforces the ABAP Cloud rules

and violations against the released object model are flagged as syntax errors during development.

Source: openSAP Courseware

"Building Apps with the ABAP RESTful Application Programming Model (RAP)".