Hi

Often you can use the substitution variable #USER_ID#

More generally you can use fnd_session_api.get_fnd_user()

It works !!! Great .

thank you so much :) 

my idea is to be able to retrieve the history of users who have created new parts and I see with this custom field that I always get the current user .. it is not a persistent field.

thanks for your help

you can make the field persistent/text, then use this code as the default value (either context substitution variable or PL/SQL expression).  

That way you can capture who created a record.

Best to also make the field non-editable through the client.

great ! thank you so much .