Sandwich panle: Shell to Solid modeling @Patran/nastran

[Abi786]

Dear All,
Greetings

Need guidance regarding shell and solid interaction for sandwich panel
inner core solid while outer surfaces are shell
How the analysis to be proceeded? please help
MPC/RBE2 and RSSCON options creating a lot of confusion
and secondly, shell and solid nodes same ID can be a solution, if yes how?
and analysis always turning back with fatal error of USER MESSAGE 9050(SEKRRS)


Advance thanks for your help

sincerely yours,

Abi