Few OrderHeader level values not passed and stored in storeOrder service. Also no code support exists for those order header fields. Below are the fields which is not taken care by the service code. We can add conditional support for these field, that means if the value comes in parameter then it will be stored otherwise not.
These values can be reset after creating order by using updateOrderHeader service, but I think this should be fine to have these and other missing values of header level as IN parameters and handled by the service.