must, Strict compliance is mandatory; absolute requirement., mustn't, Strictly forbidden; prohibited under any circumstance., should, Recommended best practice; highly desirable but not mandatory., shouldn't, Not recommended; discouraged practice., may, Optional; grants permission or expresses a possibility., can, Indicates capability or inherent system functionality., do not have to, No obligation; optional but specifically highlights the lack of a requirement.

ABAP_Module 2_Class 3.2_Review

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