Default nozzle on boot

After editing the properties for a Boot to a horizontal vessel AutoPIPE Vessel prompts for properties for a nozzle. Diameter etc of this nozzle is set to tha diameter of the boot, and as far as i can tell there is no possibility of deleting this nozzzle.

I have added all my nozzels (including the ones on the boot) to the modell. Is there any reason for this nozzle, or is it a bug in the program?

The nozzle does not show in the component list in the program, but it shows in the calculation report.