When you disable a field, the field (and any fields nested within it) is not displayed in the page, and its value expressions are not evaluated or incorporated in to any global.* attributes. If the view already contains a value for the disabled field, the value will not be modified.
<Field name=’waveset id’> <Display class=’Text’> <Property title=’accountId’> </Display> <Disable> <eq><ref>userExists</ref><s>true</s></eq> </Disable> </Field>
Disable expressions are evaluated more frequently than other types of expression. For this reason, keep any Disable expression relatively simple. Do not call a Java class that performs an expensive computation, such as a database lookup.
Use caution when referencing fields with Disable rules. Otherwise, fields inside containers might be disabled.