# `Bonny.Axn.DescendantsAlreadyAppliedError`
[🔗](https://github.com/coryodaniel/bonny/blob/v1.5.0/lib/bonny/axn.ex#L109)

Error raised when trying to register a descendant or apply the descendants
when already applied.

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*Consult [api-reference.md](api-reference.md) for complete listing*