Dropdown box value in the seCatt script

Dear SDN Community,

I have written the seCatt script to create the multiple userid's. My script fails with the following message.

S00348 Field USLOGOND-USTYP. input value is longer than screen field.

The UserType field is a dropdown box in the logon data tab of SU01 transaction.

Can you please advice me how I can specify the value of the dropdown box in the eCatt script.

Thanks!

Surya.