SSRS error in AX2012 – An item with the same key has already been added
One of our customers have been having this issue. Microsoft say it is down to a cache issue with SSRS. Most places say that a restart of the AOS and of SRRS along with a re-deploy will fix it. I have managed to get this working with either just a SSRS restart or a clearing of the AOS cache and then a redeployment of the report limiting downtime. In addition it has been reported that multiple deployments of the report can fix this issue.
