Hi Surender,
Whenever you need the SOM expression to access a particular field of a form, do the following:
1) Open the script editor where need to write the code to access the field.
2) Please make sure that curson is blinking in the editor.
3) Hover the mouse over the field of the form layout.
4) Press and hold CTRL or CTRL+SHIFT. This will make your mouse pointer icon looks like 'V', when you hover the mouse over the field as mentioned in the below point.
5) While holding the previous key combinations and mouse pointer as 'V', just click on the field.
6) You will get the corresponding absolute SOM or relative SOM expression for the field in your Script editor.
Please let me know if this helps or you need any more clarifications.
Thanks and Regards,
Arnab
