Discontinued Functionality and Breaking Changes
With SSRS 2012, a number of features have been discontinued or deprecated, including the following:
SSDT does not include the capability to create or edit Report Models or even to open Report Model projects. You can still create reports (using SSDT or Report Builder) that rely on existing models, but this is deprecated. Microsoft recommends updating existing model-dependent reports to use other data sources because support for models will likely be discontinued in the next SSRS release.
Reports built ...
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