DELETE DATA deletes the current data object AND all associated objects, if any.  

The current data object is the one highlighted on the workmap and checkmarked in the data menu. 

Associated objects are:
1) All those "below" the current data object.  An object is "below" the current data object if a path of connecting lines exists from the lower edge of the current data object to the "below" object. A "below" object may be a data object, model object, or analysis object.
2) Those "emmediately above" the current data object. An object is "emmediately above"  the current data object if it is an analysis object which is connected directly to the upper edge of the data object. An "above" object may only be an analysis object.
