Troubleshoot a circular dependency

Question

hello,

in my Table , there is already a column CC and an Index ;
I want to calculate a new column DR :

DR = 
var c_c = Table[CC]
var d_r = 100 - c_c
return if (Table[Index]=1, 100, d_r) 

I get the message "A circular dependency was detected: Table[CC], Table[CC], Table[CC]."

Any hint, please?
thanks a lot!