A CommunicationInteractionItem is the smallest entity in a CommunicationInteraction tree.<br/><br/>It concerns a unique CommunicationInteractionUseCase and involves the same CommunicationCommunicationInteractionRoles from the beginning to the end of it.<br/><br/>A CommunicationInteractionItem might have related Attachment such as the recorded conversation or embedded document in an email.<br/><br/>A CommunicationInteractionItem cannot be contained in more than one CommunicationInteraction.<br/><br/>There might be one to many CommunicationCommunicationInteractionRoles involved in a CommunicationInteractionItem<br/><br/>   - 1 CommunicationCommunicationInteractionRole if the interaction corresponds to a communication through Media<br/><br/>   - 2 CommunicationCommunicationInteractionRoles for simple interactions between Parties and / or Resources<br/><br/>   - more than 2 CommunicationCommunicationInteractionRoles when all the parties interact in the same Place (ex: face-to-face training, face-to-face marketing presentation) or through the same ContactMedium (ex: conference call)<br/>