User event script not executing

Hi all

I have a schedule script (manually scheduled) to execute at a certain time. The script transform orders to invoices.
It executes fine but the user event script, which is supposed to execute when a invoice is created (on after submit), isn't executed!

There is not problem when I start the same schedule script from a suitelet with nlapiScheduleScript or when I edit the deployment and execute it immediately by selecting "Save and execute".

Maybe this is a clue;
when starting the script manually by scheduling it (for example within an hour), the posts in the execution log for the schedule script has