Structural Authorization vs Role Authorization

What is the difference between sturctural Authorization and Role Authorization. In what situation we need to maintain the Structural Authorization? For Role Authorization, we maintain it in PFCG. Where and how do we maintain Structural Authorization?

The role authorisation is used for regular authorisation. for example Transaction codes : PA20, PR20, CAT2,CADO, PPMDT, PR05 - It is done based on role assigned by Basis group.

The user id mentioned in IT 0105 is assigned to the TC PFCG

The structural authorisation is typically belongs to HR module. It has both benefits of positive and negative tests.

Steps to do Structural Authorisation:

Step1 : TC OOAC
Activate the Structural Authorisation switch

Step 2 : TC OOSP
Create Structural Authorisation profiles

Step 3 : Assign Structural Authorisation profile to user Id
TC : SE38 and assign report RHRPROFL0 enter object id for example ( Org unit )

Assign regular Role authorisation..