Bug 149251 Inconsistent Handling of a Non-inheritable ROM Property
For a ROM property defined to be non-inheritable, an empty string property value should be consistently handled as an empty string, not as null. For example, an oda.dataSource extension defines a data source property with canInherit=false. When a oda-data-source handle get saved in a report design, it correctly includes the tag for such property, even when an empty string value is specified. <oda-data-source extensionID="my.oda.plugin" name="my Data Source" id="24"> ... <property name="ApplicationServer"></property> </oda-data-source> However, later when using the DE API to read its property value, a null is returned. Then when the report design is subsequently saved, the property tag is lost. Expects that an empty string value of a non-inhertiable property should be preserved.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/PropertyCommand.java
PropertyValueException.DESIGN_EXCEPTION_NOT_LIST_TYPE );
	}
	/**
	 * Validates the values of the item members.
	 * 
	 * @param ref
	 *            reference to a list.
	 * @param item
	 *            the item to check
	 * @throws SemanticError
	 *             if element reference is invalid.
	 * @throws PropertyValueException
	 *             if the item has any member with invalid value or if the given
	 *             structure is not of a valid type that can be contained in the
	 *             list.
	 */
	private Object checkItem( ElementPropertyDefn prop, Object item )
			throws PropertyValueException, SemanticError
	{
		assert item != null;
		assert prop.getTypeCode( ) == PropertyType.LIST_TYPE;
		Object value = item;
		if ( item instanceof DesignElementHandle )
			value = ( (DesignElementHandle) item ).getElement( );
		
		PropertyType type = prop.getSubType( );
		assert type != null;
		Object result = type.validateValue( module, prop, value );
		if ( result instanceof ElementRefValue
				&& !( (ElementRefValue) result ).isResolved( ) )