About extensible elements

[leopard21]

Hello

I used asn1c to generate s1ap/ngap encoder/decoder. command and part of asn file is as follow.

1. asn1c -pdu=all -fcompound-names -findirect-choice -fno-include-deps ../asn/36413-g40.asn -fno-include-deps 2 . HandoverType ::= ENUMERATED { intralte, ltetoutran, ltetogeran, utrantolte, gerantolte, ..., eps-to-5gs, fivegs-to-eps }

but I found that encode will be failed if I use eps-to-5gs. would you like to tell me how to compile and enable extensible element?

Thanks a lot. Jimmy