Unless explicitly stated on the documentation for a method, the accepted Web API call content types are:
Calls using any other content type (ex: text/plain) are not supported.
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APIs
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TeamDynamix.Api.Cmdb.BulkAddConfigurationItemRelationships
TeamDynamix.Api.Cmdb.BulkAddConfigurationItemRelationships.Relationships
A list of type, each containing information
about an individual relationship.