This update action produces the StoreDistributionChannelsChanged Message.
It has no effect if a given distribution channel is already present in a Store.
Adding a [Channel](ctp:api:type:Channel) without the `ProductDistribution` [ChannelRoleEnum](ctp:api:type:ChannelRoleEnum) returns a [MissingRoleOnChannel](ctp:api:type:MissingRoleOnChannelError) error.
This update action produces the StoreDistributionChannelsChanged Message. It has no effect if a given distribution channel is already present in a Store.