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ABAP Keyword Documentation → ABAP Overview → ABAP and Unicode → Differences between Unicode and Non-Unicode Programs →Names in Unicode Programs
Only the following characters are allowed in names in Unicode programs:
For compatibility reasons, the characters "%", "$", "?", "-", "#", and "*" can also be used but only in exceptional cases (for example, for existing program generations) and with good justification. Forward slashes ("/") can also be used for namespace prefixes. The program DEMO_CHARACTERS_IN_ABAP_NAMES demonstrates how these checks run in the current system.
Note
Outside of ABAP Objects, non-Unicode programs can also use characters other than the ones listed above. This can cause the following problems in these programs: