Pls the answer the below

Hi Gurus

Transaction code for purchase history and goods receipt ?

How to calculate the amount for a material?

What is partial delivery ?

I have done BDC using call transaction without going to the database ,How can I view the details which I have uploaded ?

Points wil be reward

I have searched in Wiki but i could not able to get exact answer..

Pls answer the above, Dont ignore

Thanks

Mohammed