A %DEACTIVATE statement makes an identifier inactive.
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Abbreviation: %DEACT
The deactivation of an identifier causes loss of its replacement capability but not its value. Hence, the reactivation of such an identifier need not be accompanied by the assignment of a replacement value.
The deactivation of an identifier does not prevent it from receiving new values in subsequent preprocessor statements.
Deactivation of a deactivated identifier has no effect.