Bug 153040 Template definition should be removed after the report item is deleted
Steps to reproduce: 1.New a report, extends lib.label 2.Convert the label to template report item, and revert it back to the report item 3.Delete the label 4.Remove the included library Expected result: Library can be removed Actual result: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Model Plug-in ID:org.eclipse.birt.report.model Version:2.1.0.v20060808-0630 Error Code:Error.LibraryException.LIBRARY_HAS_DESCENDENTS Error Message:The library "Lib" can no be dropped because it has descendents "NewLabel" in the current module.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementPropertyDefn.java
implements
			IElementPropertyDefn
{
	/**
	 * The message ID for the property group name.
	 */
	protected String groupNameKey = null;
	/**
	 * <code>true</code> if the value of the property can be inherited,
	 * <code>false</code> if not.
	 */
	protected boolean isInheritable = true;
	/**
	 * Default constructor.
	 */
	public ElementPropertyDefn( )
	{
	}
	/**
	 * Returns the group name (if any) for the property.
	 * 
	 * @return The (localized) group name, or null if the property is not in a
	 *         group.
	 */
	public String getGroupName( )
	{