Hello there,
i am quite new to GTA V Modding, but figured a lot out i think
i've added the Police Silverado 2017 (https://de.gta5-mods.com/vehicles/non-e…-blue-blue-blue) - it needed some tweaks to find out what to do (cause if was for fivem, but i dont use this mod) but yet it work fine ingame. In LSPDFR i use the custom agency_bla.xml file to let it spawn with fixed livery (for city, los santos and highway) and some extras always on
extra_1 // Lightbar
extra_5 // Part of the ramming bar
extra_6 // Second part of the ramming bar
this is the line in the custom angency.xml
<Vehicle extra_1="true" extra_5="true" extra_6="true" use_modkit_liveries="true" livery_multi="1">17silvrb</Vehicle>
It all work fine.
Now the problem - i tried to add the vehicle to the popgroup.ymt
It work fine, it spawn in traffic with an officer in it and it is like a normal police vehicle - but all extras and liverys are random
i found this here on the page : Extra Components
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i tried to change this in popgroup.ymt
<Item>
<Name>17silvrb</Name>
<Variations extra_1="true" extra_5="true"extra_6="true" type="NULL"/>
</Item>
The vehicle will spawn as traffic, but it has no effect ingame 
//yes i changed and added this line to all traffic variations ... poor, med, rich, highway, police etc.)
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i've modified the vehicle.meta for the Silverado
<extraIncludes>
<Item>extra_1="true" extra_5="true" extra_6="true"</Item>
</extraIncludes>
<requiredExtras>extra_1="true" extra_5="true" extra_6="true"</requiredExtras>
i am not sure about the line order for this code, but in the original vehicle.meta the requiredextras line is under the extraincludes line.
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i have even tried it with EXTRA_1 EXTRA_5 EXTRA_6 but it has no effect too
Well both tries (popgroup and vehicle.meta) come without any effect - so i missed something or do something wrong (game is still working, but changes has no effect)
if anyone have i idea or a hint what i can do to change this - i would be thankful!
the otherproblem (let the vehicle spawn with a fix livery will be the next step ...)
thx for any response
EDIT: WTF to ME!
ive tested some shit during writing this and copy the code into this thread - ive tested a last version in the vehicle.meta and it work!!!
problem solving was: EXTRA_1 EXTRA_5 EXTRA_6 had to be in BIG Letters every time ....
EDIT2: is it possible to tell the game that other extras SHOULD not be appear? now i have sometimes 2 lightbars on the vehicle (used the requireextras command)
well but there is still the livery problem
i want a special livery for
city livery_multi="1"
los santos livery_multi="2"
highway livery_multi="2"
(code is from the custom agency.xml)