Bug 148761 Unable to copy a report item from template to report
Steps: 1. Create a template, add a Text item "t1" or others 2. Create template item using "t1" 3. Double click the template item and we get a report item again. 4. We copy the item, paste to another report file. Expected: the text item can be copied. Actual result: Nothing happened, not copied and no error msg.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/SlotDefn.java
* The slot ID. The ID is unique to an element type. In implemenation, it
	 * may give the position of the slot within an array of slots. Each element
	 * class defines the list of slot IDs for that element.
	 */
	private int slotID = 0;
	/**
	 * Slot cardinality. True if the cardinality is multiple, false if the
	 * cardinality is single.
	 */
	private boolean multipleCardinality = true;
	/**
	 * Internal name.
	 */
	private String name = null;
	/**
	 * The message ID for the display name for the slot.
	 */
	private String displayNameID = null;
	/**
	 * Pointers the the element meta data for the element types that the slot
	 * can hold.
	 */
	private ArrayList contentElements = new ArrayList( );
	/**
	 * List of one or more element type names that the slot can hold.
	 */
	private ArrayList contentTypes = new ArrayList( );
	/**
	 * Predefined style for elements in this slot. Null means that the slot does
	 * not define a predefined style.