SAP Best Practice for Document Type./Item category/Acc assignment cat.

Question

What is the Best Practice for the document Type & Item category
I want to use NB -  Item category  - B & K ( Blanket PO) , D ( Service)  and T( Text) .
Is sap recommends to use FO Only for the Blanket Purchase Order.
We want to use service contract (with / without service entry sheet) for all our services.
We want to buy asset for our office equipments .
Which is the best one to use NB or FO ?
Please give me any OSS notes or reference for this
Thanks
Nick

Answer 1

Thank you very much for your response. 
I hope I can provide some clarity on how the accounting needs to be handle per FERC  Regulations.  The G/L balance on the utility that is selling the assets will be in the following accounts (standard accounts across all FERC Regulated Utilities):
101 - Acquisition Value for the assets
108 - Accumulated Depreciation Value for the assets
For an example, there is Debit $60,000,000 in FERC Account 101 and a credit $30,000,000 in FERC Account 108.  When the purchase occurs, the net book value for the asset will be on our G/L in FERC Account 102.  Once we have FERC Approval to acquire the plant assets, we will need to enter the Acquisition Value and associated Accumulated Depreciation onto our G/L to FERC Account 101 and FERC Account 108 respectively with an offset to FERC Account 102.
The method that I came up with is to purchase the NBV of the assets to a clearing account.  I then set up account assignments that will track the Acquisition Value and respective Accumulated Depreciation for each asset that is being purchased.  I load the respective asset values using t-code AS91 and then make an entry to the 2 respective accounts with the offset against the clearing account using t-code OASV.  Once my company receives FERC approval, I will transfer the asset to new assets that has the account assignments for FERC Account 101 and FERC Account 108 using t-code ABUMN or FB01.