The Personify WSD prompts the developer to refresh the element definitions if it identifies that a developer is working with an element that another developer has modified and checked-in. In other words, the developer needs to refresh the element definitions if the Personify WSD identifies that the developer is working with an older version of an element. Typically, this validation is performed when a developer checks-out, checks-in, or publishes to the server.
Developers may refresh the element definitions any time by selecting View > Refresh from the toolbar menu.