Read Context Node Value in CRM

Hi ,

My requirement is ,

I need to read context node attribute value that is BP Partner and on the basis of this I need to fetch one relationship and display that relationship in another field on output.

My question is :-

1) How to read context node value from view, from opportunity I have to read BP Partner??

2) On the basis of this BP Partner I need to fetch relationship (Table BUT050)  on the basis of BUT050-PARTNER1 and BUT050-RELTYP I need to                fetch BUT050-PARTNER2 , So should I write Select Query or what should be the approach.

3) After fetching the BUT050-PARTNER2 I have to display it on view , I am using BT111H_OPPT_PR and enhance it with Z Enh Set, The new field should      I add it under existing node or create new node.    

4) The new field does not exist in BOL , so should I have to create or enhance anything in BOL or I will just take reference of any other field and create      it on view.

Please Confirm

Ankesh Jindal