Append the subject line in SD_+ request with a cutom field ( SCRIPT)

Append the subject line in SD_+ request with a cutom field ( SCRIPT)

HI
Im trying to append the subject line with a custom (additional) field called Employee's Name (UDF_CHAR7) so that the subject field has the existing subject line and then append the Employees name to the subject when the form is saved (submitted)

the code i have doesn't seem to work and im using the cloud version
It seems to append the subject with the word null instaed of the employee name 
Thc
Mark