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
String propName = prop.getName( );
			if ( !( (MasterPage) element ).isCustomType( module )
					&& ( MasterPage.WIDTH_PROP.equals( propName ) || MasterPage.HEIGHT_PROP
							.equals( propName ) ) )
			{
				throw new SemanticError( element,
						SemanticError.DESIGN_EXCEPTION_CANNOT_SPECIFY_PAGE_SIZE );
			}
		}
		value = validateValue( prop, value );
		if ( element instanceof GroupElement
				&& GroupElement.GROUP_NAME_PROP.equals( prop.getName( ) ) )
		{
			if ( !isGroupNameValidInContext( (String) value ) )
				throw new NameException( element, (String) value,
						NameException.DESIGN_EXCEPTION_DUPLICATE );
		}
		
		if ( prop.isIntrinsic( ) )
		{
			setIntrinsicProperty( prop, value );
		}
		else
		{
			doSetProperty( prop, value );
		}
	}