If you're using a recent version of Cognos Analytics, the release notes are usually published in the IBM documentation for each version and fix pack. I normally search by the exact version number (for example, 12.x.x or 11.2.x FPx), which gets me to the right page much faster than browsing through the docs.

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One thing I'd also recommend is testing the change in a non-production environment first if possible. It's a quick way to catch any unexpected side effects, especially if the report or package is used by multiple people.

I'd also suggest checking with a different sample file or a clean configuration if anyone else runs into the same issue. It's a quick way to tell whether the problem is data-specific or something in the environment, and it can save a lot of time troubleshooting.

It definitely seems like something was updated behind the scenes. Pages have been loading a lot smoother on my end recently, so if a server migration happened, it was definitely a welcome change!

I always like giving new sounds a few listens before forming an opinion, especially on different headphones or speakers. It's interesting how much your impression can change after a bit more time with it.

Good suggestions above. I'd also verify that the data types and any joins or filters are doing exactly what you expect, since small mismatches there can lead to some confusing results. If you can share a simplified version of the report or query, it's usually much easier for people to spot the issue.

These AI inspired instructions worked for me which included creating a new data item which I had not tried in my earlier attempts to use the Minimum expression.

1. Open your report in Edit mode and go to Queries.
2. Create a New Data Item in your query and name it something like Unique_Record.
3. Set your expression using the following syntax:minimum([Column_to_Check] for [Grouping_Key_1], [Grouping_Key_2])(Replace Column_to_Check with the item you want to extract, and Grouping_Key with the core columns that define the unique entity).

Understood - as that is of course the appropriate (possibly only) long-term solution bus_pass_man.

I think the problem should be defined as someone messed up and corrupted the table (and possibly others too) and the incorrect data needs to be removed rather than how do I work around the corruption.  As such, there needs to be at least one meeting, probably more, involving a manager, almost certainly many sunrays up the chain, so that people in authority know about the problem.