I have a backend system which send the fields updatetime,bid,ask,last to the dataadapter of Lightstreamer. Updatetime is filled every time, the other fields are sometimes null.

On the client I want a scrolling grid, which gets all updates of the field last, where the field is not null. Easy thing, a Dynagrid with a subscription to the field last, works perfect.

Now I want the updatetime in this grid, too. Just adding to the subscription will not work obviously, because then I get all events to the scrolling grid, even if the last is null. Is there a way, to tell the subscription, that the field updatetime should be transferred to the client when any other field triggers the subscription, but should not trigger when just this field within the subscribed fields is changed, or do I have to extend the field list sent to the dataadapter with a copy of the field updatetime, which is only filled when the last field is filled?