title: InfoPath won't let me customize forms for list
body: <p>When i try to create a custom InfoPath form on my Orders List I get the following error:</p>
  
  <p><em>The SharePoint list form can't be customized with InfoPath because fields of an unsupported data type are marked as required, or because fields are corrupted. In SharePoint, try deleting the columns or editing the column properties to remove the required attribute. - Product (Lookup)</em></p>
  
  <p>Additional information:</p>
  
  <p>The Site contains;</p>
  
  <ul>
  <li><p>Two Site Content types Product and Order. Order does have a lookup field to product, it is a optional field so NOT required.</p></li>
  <li><p>Two Lists. A Products list with Product as Content Type and an Orders list with Order as Content type.</p></li>
  </ul>
  
  <p>The Site Collection has the SharePoint Server Enterprise Site Collection features activated. Creating custom InfoPath forms for the Products lists works without any problem.</p>
  
  <p>I tried to delete my List and recreate it but it i still get the same error. Hope someone can help me with this issue.</p>
  
  <p>Thanks</p>