MSBuild 15.0 (Visual Studio 2017) error MSB4067 for SSDT (SSRS and SSAS) projects: “The element beneath element is unrecognized”

Question

MSBuild 14.0 (the version included with Visual Studio 2015) logs warnings (MSB4078) when building a solution which contains SSDT projects (rptproj or dwproj projects). For examp

Answer 1

Update (October 2017)

The latest version of Microsoft Reporting Services Projects for Visual Studio (1.18) adds MSBuild support for SSRS projects. With this installed, SSRS projects can be updated to a format supported by MSBuild, which prevents this problem from happening.

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Original Answer

This is a bug in MSBuild 15, labelled for fix in "foundation update 2".

A workaround as given in the GitHub issue thread by one of the MSBuild maintainers is:

Place a file with these contents next to your .sln file with the special name:

after.{yoursolutionname}.sln.targets

This seems to work provided that there are no Project Dependencies from other .csproj projects to the .rptproj projects.