NAV R2 Web Service SLine Update

yukon

Hi Expert,

Currently, i'm facing with this problem. Let me explain first. I'm developed sales quote web project. First time, when i use NAV 2009 SP1, my project is ok. But when i change to NAV R2 mostly function are smoothly run. But at the sales line update i got this error. Sales Header is cannot be more 200 bytes. I got this error message when i write down code at c#

       string Key = SalesQuote.SalesLine[0].Key;
       _ws.Update(ref SalesQuote);
       bool IsUpdated = _ws.IsUpdated(Key);//     at here (when i remove i didn't get any error).

Anybody know this error? Kindly, please explain to me.
One more thing, can we publish and use item tracking and select entires function in item tracking line. If it possible to do, kindly advice to me.

Best Regards,
Yukon