title: Complex validation rule in Microsoft access
body: <p>I want to have a complex validation rule in Microsoft access. The string should be 9 digits and validate with the following formula.</p>
  
  <p>For example, if the string is ABCDEFGHI:</p>
  
  <p>(9 x A) + (8 x B) + (7 x C) + (6 x D) + (5 x E) + (4 x F) + (3 x G) + (2 x H) + (-1 x I) % 11 == 0.</p>
  
  <p>Can I use this as a validation rule or should I use code for it? If I have to use code, how would I have to do it?</p>