KB202676: Message ID remain same for reports or Report Service documents sent to history list by same subscription in MicroStrategy Web 9.x

SUMMARY: 
In Strategy Web 9.x, user can send a report or Report Service document to history list using subscription based on a schedule. When a newer version is sent by the schedule, messageID remain same.
 
STEPS TO REPRODUCE:
 Follow below steps to reproduce with Strategy Tutorial project:

• Create an event;
• Create an event trigger schedule;
• Subscribe a report to history list using above schedule;
• When configure the subscription, make sure the "The new scheduled report will overwrite older versions of itself" is checked as shown below:
  

• In Web--History list, run the history list report and check in detail page, record message ID.
  

• Modify the report to have different result;
• Trigger the schedule again;
• Check messageID, it remain same.
  

 
CAUSE:
This behavior is by design . User can use same message ID to access latest scheduled report or Report Service document.