The requestId header specifies an NMTOKEN that identifies the current request for logging purposes. Each log entry contains this requestId. If this header is empty or absent, a request ID in the form IMA9-INV-<random UUID> is generated for the current request, for example:
<requestId:requestId xmlns:requestId="http://www.tsystems.com/ima/9.0/integrationws/header/request-id">4711</requestId:requestId>
Figure 560: Example header – requestId