title: "Unresolved Reference To Built In Type" errors on basic SQL data types
body: <p>My database projects in Visual Studio have recently starting throwing these unresolved reference errors every time any <code>create table</code> file in the project is touched.</p>
  
  <pre><code>SQL71501: Column: ___ has an unresolved reference to Built-in Type [int].
  SQL71501: Column: ___ has an unresolved reference to Built-in Type [datetime].
  SQL71501: Column: ___ has an unresolved reference to Built-in Type [varchar].
  </code></pre>
  
  <p>If I rebuild the project, everything builds with no errors, and the errors flagged by Visual Studio disappear. However, as soon as I edit any file (even as little as adding a space to the end of a file), that file will immediately become plagued with these unresolved reference errors... <em>until I rebuild again</em>. However, as it's a fairly large project, I don't want to spend about a minute rebuilding after every single minor edit.</p>
  
  <p>This project is worked on by several other people, who do not encounter this issue. How can I resolve this?</p>
  
  <hr>
  
  <p>Update: If I change tabs, the errors for the first tab disappear until I go back to it. I've also disabled all extensions, but the problem still occurs.</p>