asNegateSavingsPlanActionOrNull
Casts this BillScenarioCommitmentModificationAction as a NegateSavingsPlanAction and retrieves its aws.sdk.kotlin.services.bcmpricingcalculator.model.NegateSavingsPlanAction value. Returns null if the BillScenarioCommitmentModificationAction is not a NegateSavingsPlanAction.