Prepares the required information for starting the palette drag and drop operation.

The unit classifier.The board classifier.The drag and drop object.The dragged palette item.Returns the rule's success/failure status.<h2>Dependencies</h2><div class="INSET">None</div> <h2>Behavior</h2> The rule should update the given <code>dnd</code> object with the relevant drag and drop information. See <q ref="core.dev:Controller!DND_OBJECT">DND_OBJECT</q> for details.(c) SAP AG 2003-2006. All rights reserved.