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/ElementRefPropertyType.java
*             one defined in the <code>defn</code>.
	 */
	public Object validateValue( Module module, PropertyDefn defn, Object value )
			throws PropertyValueException
	{
		if ( value == null )
			return null;
		ElementDefn targetDefn = (ElementDefn) defn.getTargetElementType( );
		if ( value instanceof String )
		{
			logger.log( Level.FINE,
					"Validate the value of the element reference property as a string: " 
							+ value );
			return validateStringValue( module, targetDefn, defn,
					(String) value );
		}
		if ( value instanceof DesignElement )
		{
			logger.log( Level.FINE,
					"Validate the value of the element reference property as a DesignElement " 
							+ ( (DesignElement) value ).getName( ) );
			DesignElement target = (DesignElement) value;
			return validateElementValue( module, targetDefn, defn, target );
		}
		
		logger.log( Level.SEVERE, "Invalid value type: " + value ); 
		throw new PropertyValueException( value,
				PropertyValueException.DESIGN_EXCEPTION_INVALID_VALUE,
				PropertyType.ELEMENT_REF_TYPE );
	}