Hello Shuki,
This is a very interesting thing and I think there is a solution for this.
In the current situation the only way to resolve the problem is to define a custom button in the toolbar which calls the edit row.
Now the simplest way is:
In the onclick action of this button
1. Get the id of the row.
2. Make ajax call to the server which obtain this row in json (or any other way):
2.1 On succes event of the ajax call get the data
2.2. analyze this data with your conditions.
2.3. Use setRowData to update the content of the grid row from the ajax call
2.4. if everthing is ok call editGridRow with disabled row navigator buttons in the form.
Enjoy
Tony
