title: MS Access - Calculated field with null values
body: <p>I'm trying to create a field to a database where the value is based on the sum of 2 other fields in the database which contains null values. I am trying to add</p>
  
  <pre><code>NZ([Number1])+NZ([Number2])
  </code></pre>
  
  <p>to the Expression in "Field Properties" "General" but access won't save it. Any ideas what i'm doing wrong?</p>