FRA 2 - Compensation Growth Rate Assumption Classification guidance, directly, references

former

I am bit confused on how to classify this assumption as I have read conflicting references, and would appreciate some guidance.

Would a change in the compensation growth rate go under actuarial g/l or service component of the pension expense? I am assuming that it is directly to the service component, but I read somewhere in the book that if the comp growth rate assumption changes, that it is a part of actuarial g/l?