I’m slightly late in posting this one but I figure it might still be a useful post to make.

On 30th April 2012 Microsoft released Rollup 1 for Management Reporter 2012 for Microsoft Dynamics ERP which includes an updated Migration Wizard [PDF] which was missing from Management Reporter 2012 until now.

Rollup 1 can be downloaded
'>here
(PartnerSource or CustomerSource login required).