If you have Subversion pre-commit hooks that require a comment, or that require a comment of a particular format, linking a database for the first time might fail.
This happens because the first time a database is linked, SQL Source Control adds a folder structure and some accompanying metadata to source control, and the default comment may not be appropriate.
If your pre-commit hooks stop you linking a database within SQL Source Control, you can create the initial link manually. To do this: