Prerequisite of running MRP

Hi, friends,

I am new in MM, here is a question confused me .

according to SCM 500,  before running MRP, we need "activate material requirements planning" and "carry out overall maintenance of plant parameters"

But according to TAMM40, We need "set up planning file" instead of " carry out overall maintenance of plant parameters"

what's the relationship between them,  are they talking about the same thing?

Thanks

TANG