Save records with ListGrid.endEditing()

Version: SNAPSHOT_v9.1d_2013_10_15

Hi Isomorphic/All,

I know that am I missing something, but what is it?

I have the next scenario:
- A GridList which datasource is fetch directly from the database and autoSaveEdits: true.
- Every record on this GridList have 3 fields:
* quantity (editable)
* price (non editable)
* total (non editable)

- In a ToolStrip embedded to this Grid, there is a save button that calls on click: GridList.endEditing();

When QUANTITY field changes the next action is taken:
record.total = record.quantity * record.price

Why when I press the save button, my calculated value (record.total) is not present in the database?
I can see it in the grid, but it is not saved.

What am I missing?
The documentation says, that if endEditing() is called with autoSaveEdits: true, the changes are saved in the server.

Pls help.
Thanks in advance