SAP GRC BRF+ OBJECTS FOR INITIATOR, ROUTING AND AGENT RULES

Hi SAP GURUS,

can any one explain the BRF+ structures.

I am a beginner to BRF+ application. when I am trying to create table for initiator rule or agent rule,

I am getting 2 options to select:

1. Access Request Line Item

2. Request Header

and both have the same objects, can u tell me, do I need to select the objects from 1. Access Request Lie Item or 2 Request Header?

and can u also explain about following 4 structures:

1. Access Request Line Item

2. Request Header

3. Result Routing Rule

4. Role Function Area

Thanks in advance. the correct answer will be rewarded with points.