Version 4 to 4.6,4.6 to 4.7,4.7 to ECC 5.0,ECC 5.0 to ECCC 6 .O(High priori

Hai Consultants,

Pl send the me link ,What is the diffence between various Versions of SAP, only in purchasing and inventory applications.

Let me explain my needs clearly,

1.What we cant do in 4.o ,that we can do it in 4.6/4.7

2.What we cant do in 4.6/4.7,that we can do it in ECC 5.0/ECC 6.0

I have to give some presentation ,so I need your advice as early as possible.