Affected SOP instance UID

For the request/indication, this parameter specifies the SOP Instance which is used by the performing DIMSE-service-user. If the SOP Instance UID is not supplied by the invoking DIMSE-service-user, then the performing DIMSE-service-user assigns a value to this identification of instance. For the response/confirmation, this parameter may only be included in the success response/confirmation and shall be included if it is not supplied by the invoking DIMSE-service-user.