Security permission to execute script on phonecall

Hi all,

I have an onLoad-Script running on a phonecall form. The script retrieves some information from the lead that is the recipient of the call and stores this information in the phonecall entity record.

Now I designed a new security role, but if the user the role is assigned to opens a phonecall the script doesn't seem to be executed. Therre's no error message. Probably there's an error in the role but I can't figure out which permission is missing. Is there a hint?

Thanks

Kathrin