Sigasi Visual HDL (SVH) flags an error if a mismatch exists between the selected VHDL language versions of a project, VHDL common libraries, and individual design files (rule 170).
Applying the associated Quick Fix will upgrade the version of the project,
or - if it’s already set up correctly - it’ll upgrade the version of the file with the outdated version.
The Common Libraries will automatically be updated to the upgraded version.
In SVH, you can set the version of the VHDL language for your project and individual files. The setting for individual files is only intended for compatibility with legacy code. Setting a higher VHDL version on a design file than the VHDL version of the project is not supported and will cause this error to appear.