ERPstuff - Oracle EBS Community

Can anyone explain me in detail about the following

1. Stockable Item
2. Non-stockable Item
3. Expense Item
4. Capital item

I will be more thankful provided the examples also.

stockable item- laptop
Inv flag y
inv asset flag y
costing flag Y
stockable Y

2-non stockable item --pens

Inv flag y
inv asset flag y
costing flag Y
stockable N

3) Expense- Oil papers
Inv flag N
inv asset flag N
costing flag N
stockable N