Brain Dead Long day

Can someone please tell me how to assign a field on a form two other field values?
i.e.
OnBeforeInsert
{FULL_NAME} = “{Last_Name}, {FIRST_NAME}”;

Doesnt work

Hello,

Try: {full_name} = {last_name} . ", " . {first_name};

regards,
Bernhard Bernsmann

Nope didnt do anything…
also tried using single quotes…

On which event are you filling things?