Property (8)

True

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isUnlabelledFallback

This can be marked 'true' to indicate that some published [DeliveryTimeSettings](https://schema.org/DeliveryTimeSettings) or [ShippingRateSettings](https://schema.org/ShippingRateSettings) are intended to apply to all [OfferShippingDetails](https://schema.org/OfferShippingDetails) published by the same merchant, when referenced by a [shippingSettingsLink](https://schema.org/shippingSettingsLink) in those settings. It is not meaningful to use a 'true' value for this property alongside a transitTimeLabel (for [DeliveryTimeSettings](https://schema.org/DeliveryTimeSettings)) or shippingLabel (for [ShippingRateSettings](https://schema.org/ShippingRateSettings)), since this property is for use with unlabelled settings.

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This can be marked 'true' to indicate that some published ShippingRateSettings are intended to apply to all [OfferShippingDetails](http://schema.org/OfferShippingDetails) published by the same merchant, when referenced by a [shippingSettingsLink](http://schema.org/shippingSettingsLink) in those settings. It is not meaningful to use a 'true' value for this property alongside a shippingLabel, since this property is for use with unlabelled ShippingRateSettings.

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