CDHDR CDPOS for BOM

Hi All,

I have few questions on change documents,

I am creating an report to get the details of BOM creation/change details based on object class, date and time .

I want to run the program using from_time and to_time .Did any one have experiance on this ?

1) If change document details available in CDHDR , Then why we need to care about CDPOS ? is there any link ?

2) I have two objects class for BOM i.e STUE_v and STUE . Which one should I use and what is the difference between them ?

Please explain me in detail if possible.

Thanks,

Vinay.