RE: Having to rebuild MR DataMart after every version 2018.3.1200 update
Due to a change with GP18.3, it is required to reconfigure change tracking after the upgrade. Terry added a note to the blog that mentions this (I believe you referred to it):
community.dynamics.com/.../microsoft-dynamics-gp-2020-new-feature-blog-series-schedule-410418203
This is the process:
-Log into the MR server as a user who is an Administrator in MR.
-Start the MR Configuration Console.
-Select the data mart integration.
-Click the "Reconfigure change tracking link" at the top right.
-Enter 'sa' credentials.
-Click Data Mart Integration under Logs and click the Refresh button to confirm the errors stop.
We have seen this process correct the change tracking errors so if that didn't fix it for you, I'm not sure why. Note that it can take some time before you start seeing successful messages as MR waits until the next time the task is scheduled to run and some of the longer ones like GL Transaction to Fact can take a while. Maybe try waiting for a while and refresh to confirm they eventually go away.
One other thing to note is that if the change tracking errors were allowed to persist and users started to use the system before it was enabled, you may be missing data in the data mart and that would require a rebuild. I apologize for any inconvenience this creates.