Converting BI Documents Between Tools

[The Editor]

Has anyone ever heard of a tool that converts reports or metadata objects between BI products. A lot of companies are choosing to change their BI tool and embarking on large projects to convert reports from tool A to tool B.
As most of the current BI tools are simply SQL generators with a presentation layer, it would seems obvious that tool could be written to convert these objects. The presentation layer is normally in XML and the SQL behind the report is also accessable by most languages so I'm wondering why I can't find a tool on the internet to do this for me.
Could it be because companies choose not to convert but re-engineer when they change BI tools. Perhaps it provides an excellent opportunity to revise and consolidate their entire reporting suite and a conversion tool is not necessary.
Anyone have any thoughts

[Steve Bennett]

I am pretty sure that nothing exists to convert to/from the Business Objects and Cognos platforms. Perhaps someone else knows more?

Of course life in the data integration space is simpler, after all SQL is just SQL isn't it? OK, just kiding!

Anyone for SQL/PSM, SQL PL, T-SQL, MySQL, PL/SQL and PL/pgSQL??