OriginatingSystemResourceRecordId Field

DefinitionThe originating system's well-known identifier of the related record from the source resource. The value may be identical to that of the key, but the ID is intended to be the value used by a human to retrieve the information about a specific listing. With multiple originating systems or a merged system, this value may not be unique and may require the use of the provider system to create a synthetic unique value. This most commonly would be the ListingId as it exists in the originating system.