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Sitecore versions: Expected to work with 5.3.0.x releases.

Q:

The 'selected' listbox is emptied when the value of the Query.MaxItems setting in web.config is altered.

Please take a look at the scenario below.

1. Create a template with the multilist field. Type the source into this field "/sitecore/templates/System".
   
   
2. Create an item based on this template and select a value which is placed at the bottom of the list in the multilist field (for example, 'Workflow'). Save.
   
   
3. Change the value of the Query.MaxItems setting in your web.config to 10 (the sequence number of the selected item should be greater than the value of this setting).
   
   
4. Go to the created item. As you can see, the 'selected' listbox is empty.

Is it expected behavior for the multilist field?

A:

Yes, this is expected as the 'Workflow' is not one of the first 10 selected items.

Conclusion: the 'selected' part of the MultiList field type shows the selected items only if their sequence number in the list (tree) is lower than the Query.MaxItems setting value in web.config.