Need new Skey for INST

Hello guys,

I am in situation where I need to create new SKEY for Instrument.
this instrument is having 6 Ports. (1-Arrive, 1-leave, 4 - tapings) (Total 6 Points)

I tried to use IIFL as base Key. But it didn't work.

Any suggestion about selection of base key?

I tried with NCFL.

It works now