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
/**
	 * Sets whether to allow multiple cardinality.
	 * 
	 * @param flag
	 *            The cardinality: multiple (true) or single (false).
	 */
	void setMultipleCardinality( boolean flag )
	{
		this.multipleCardinality = flag;
	}
	/**
	 * Returns the localized display name.
	 * 
	 * @return the display name
	 */
	public String getDisplayName( )
	{
		assert displayNameID != null;
		return ModelMessages.getMessage( this.displayNameID );
	}
	/**
	 * Returns the message ID for the display name.
	 * 
	 * @return the message ID for the display name
	 */
	public String getDisplayNameID( )
	{
		return displayNameID;
	}
	/**