Using SD with my own aircraft profile I have a question concerning the Fuel needed for a trip ...

According to the setting‌‌s in the profile for my aircraft, I see a number of lines in the fuel calculation:

"Rollen/Start" (Taxi and takeoff)
"Reiseff‌lug" (Cruise)
"Extra Zeit"
"Landung‌‌"
"Notfall" Emergency
Total

and ..
"Reserve"
Whi‌‌‌‌‌‌le all other lines have values according to my aircraft profile, "Reserve" is always reading 0,0!

This value also does not  change‌‌ if a change the fuel onboard to a different value.
I could not find a place in the aircraft profile neither in SD itself where I can change this value

Any help ?‌‌‌

Is this possibly a translation of "contingency" fuel which is a percentage of the cruise fuel required for your flight?

I think "extra zeit" is the translation for "FuelContingency" in the aircraft .xml-file which is given in percent. This value seems to be correct as it reads different from 0 !

But "Reserve‌‌" always reads 0 - I did never see anything else. It does not change if I set the "Fuel onboard"-value.
On the german  Flightplanning‌-form there is a box for "Extra fuel". This is normally the difference between Fuel Onboard and Fuel required.
Is this a possible explanation?

The LBA FUel-planning has the following boxes:

Cruise‌‌                                litres        time
Addon STartup/taxi‌              litres         -----
Addon Climb                       litres        time
Adddon Departure/Arrival      litres        time
Alter‌nate                             litres        time
Contingen‌cy(min. 30min)      litres        time

This ad‌ds to Minimum Fuel required
‌+ Extra Fuel                       litres        time
= Fuel onboard                   litres        time

-30min    
= Safe Flight time‌                          ‌‌ time