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
/**
	 * Builds the semantic information for this property. Called once while
	 * loading the meta-data. The build must succeed, or a programming error has
	 * occurred.
	 * 
	 * @throws MetaDataException
	 *             if the build is failed
	 */
	public void build( ) throws MetaDataException
	{
		super.build( );
		
		
		
		if ( isIntrinsic( ) && isStyleProperty( ) )
			throw new MetaDataException( new String[]{name},
					MetaDataException.DESIGN_EXCEPTION_INCONSISTENT_PROP_TYPE );
	}
	/**
	 * Returns the message ID for the group name.
	 * 
	 * @return The group name message ID.
	 */
	public String getGroupNameKey( )
	{
		return groupNameKey;
	}
	/**
	 * Sets whether the property value can be inherited by subclasses.
	 *