I came across a really odd bug today in SSRS 2005.
Bascially we have a report that has a combination of dependent parameters.
The last parameter MDX string value is then passed into the MDX dataset as a constraint.
The problem came up as the final parameter could result in the same value for 2 options; based on the other parameter selections.
For some reason the report couldn’t handle this and just passed in the first possible value each time and didn’t then allow the selection of the second option.
The solution was to make the possible outcomes of the final parameter unique by adding a nominal “YYY” to the start MDX string output, then stripping this back off when passing the parameter back into the main MDX dataset.
Very odd, I am sure there is a cleaner way to deal with this though.