Why are reports in big corporations so difficult to understand? Is there a way to effectively document them and make them more understandable for the business user?
Don't insist on strict discipline when it comes to your internal processes' protocols. Instead, try installing a thin support layer above all of your key IT/BI systems. If you allow this layer to become the natural workspace for all of the individuals participating in the processes, the protocols will be respected spontaneously.
Both data quality and metadata management are a hard-sell to business users. Both concepts sound abstract and far from the reality of business. Despite that they can make more sense combined than each remaining separate.
One rough picture explains more than a thousand words. So why not provide picture-based documentation of your reports to business users?