Should Request include not updated fields in <data> tag?

[Oleg]

Hi

My environment:
1. SmartClient Version: SNAPSHOT_v8.3d_2012-06-12/LGPL Development Only (built 2012-06-12)
2. browser IE8

When I update one field in ListGrid and save record, my request <data> tag contains key and updated field only:

<request>
  <data>
    <idActivity>3</idActivity>
    <activityFinish>2012-06-21T06:09:00</activityFinish>
  </data>
  <oldValues>
    <updateTime>2012-06-29T13:03:22</updateTime>
    <updateIdUser>9</updateIdUser>
    <idActivity>3</idActivity>
    <idObject>33</idObject>
    <comment>my comment here</comment>
    <activityStart>2012-06-20T22:09:02</activityStart>
    <activityFinish>2012-06-20T22:09:02</activityFinish>
    <idActivityStatus>0</idActivityStatus>
  </oldValues>
  <dataSource>isc_ActivityDS_0</dataSource>
  <operationType>update</operationType>
  <componentId>isc_ActivityForm_0</componentId>
</request>

When I put record to DynamicForm

editForm.editSelectedData(grid);

and update the same field, <data> tag includes full set of fields whether they were updated or not:

<request>
  <data>
    <updateTime>2012-06-29T13:03:22</updateTime>
    <updateIdUser>9</updateIdUser>
    <idActivity>3</idActivity>
    <idObject>33</idObject>
    <comment>my comment here</comment>
    <activityStart>2012-06-20T22:09:02</activityStart>
    <activityFinish>2012-06-21T06:09:00</activityFinish>
    <idActivityStatus>0</idActivityStatus>
  </data>
  <oldValues>
    <updateTime>2012-06-29T13:03:22</updateTime>
    <updateIdUser>9</updateIdUser>
    <idActivity>3</idActivity>
    <idObject>33</idObject>
    <comment>my comment here</comment>
    <activityStart>2012-06-20T22:09:02</activityStart>
    <activityFinish>2012-06-20T22:09:02</activityFinish>
    <idActivityStatus>0</idActivityStatus>
  </oldValues>
  <dataSource>isc_ActivityDS_0</dataSource>
  <operationType>update</operationType>
  <componentId>isc_ActivityForm_0</componentId>
</request>

In both cases I use the same datasource inherited from RestDataSource.

Why the number of fields in <data> tag is different?
Is there some option which could allow me to apply the same <data> format for whole application?

Thanks in advance