Questions about my expression for Trailing Twelve Month Statistics Account

I would like write a Trailing Twelve Month Revenue expression.  I have a few questions with the pseudocode.  I wrote 2 options for the pseduocode and wasn't very sure

if they first option is even executable.  In addition, the Trailing Twelve Month Revenue expression will be going between years when it executes. Will this cause any issues?

Option 1(Is this way of writing it even execuatble):

vTTM=P#CUR+P#CUR-1+P#CUR-2+P#CUR-3+P#CUR-4P#CUR-5+P#CUR-6+P#CUR-7+P#CUR-8+P#CUR-9+P#CUR-10+P#CUR-11

HS.Exp "RevenueTTM=A.TradeRev.I#Tops.C2#[None] & 'vTTM'"