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You can no longer add symbols to an extended enum. This is because if an enum is subtyped and the subtype attempts to add additional symbols that aren't legal values enumerated in the supertype, that "is-a" relationship no longer holds.

For more information, see Relationships Between Concepts in Modeling Concepts.

Deprecation Stages (learn more)

• Stage 1: R20K
• Stage 2: R20N
• End of Life: None