Bug 121864 Report element can't be deleted
Description: Report element can't be deleted Steps to reproduce: 1.Open the attached design file 2.Delete the table/parameters/dataset/datasource Expected result: The element can be deleted Actual result: They can't be deleted
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
ContentRecord dropRecord = new ContentRecord( module, element, slotID,
				content, false );
		ActivityStack stack = getActivityStack( );
		stack.startFilterEventTrans( dropRecord.getLabel( ) );
		try
		{
			doDelectAction( content, unresolveReference );
		}
		catch ( SemanticException ex )
		{
			stack.rollback( );
			throw ex;
		}
		
		stack.execute( dropRecord );
		stack.commit( );
	}
	/**
	 * Changes derived elements to derive from the parent (if any) instead.
	 * 
	 * @param obj
	 *            the element to clean up
	 * @throws ExtendsException
	 *             if an error occurs, but the operation should not fail under
	 *             normal conditions
	 */
	private void adjustDerived( DesignElement obj ) throws ExtendsException
	{