Item Definition Issue
I have following query, when i am trying to define Inventory item "Inventory" tab is diable mode, so how we can make it as enable "Inventory" tab.
i need to define 3 different items,
1. Expense Item / Service item
2. Inventory Item
3. Asset Item non stockable
4. Asset Item Stockable
please tell how we can define , what are changes between thse item definition process.