Set columns as not null

To add a who column to the existing tab;e

I have created a form on the table which has the two who columns last_updat_date and creation_date.

I want to add created_by and last_updated_by and fill the values when i insert the data in the form.

I used fnd_standard.set_who to set the who columns but the values are entered only in the
last_updat_date and creation_date which was available already and the data is not getting entered into the columns created_by and last_updated_by (which i have created)

I was unable to set the columns as not null.

Please advice me in filling the who columns when i insert data into the table from the form.

Thanks ,
Jency

Can you kindly post your code for reference of our experts please.

dear

ur question seems to be very obscure.Pls be more specific.