Special cargo missions impossible?

[Q]

I tried to create a special cargo mission, that would be triggert by an event: execute job Xiati 1. Xiati 1 would be a normal cargo job but with specified target and cargo.
The job is however displayed as: "Load cargo at planet X".
This is done automatically in normal cargo jobs and of course the specified cargo is not present.
What is wrong???
I tried the event "Add Player Cargo" to help but here I don't know what the third parameter "Job Event ID" is supposed to do. I tried to insert here the job (Xiati 1) but then the game crashes with the error message that "Xiati 1 is not an integer".
Any ideas??