There are times where you might have an inventory item that you want to transfer to become a fixed asset. For example you sell machines and you decide you are going to rent one of your machine. So you can transfer it from inventory to become a fixed asset and then you can track the depreciation on it in the fixed asset register. To do this you just need to have you item in inventory and have create a fixed asset number. Then when you run the inventory to fixed asset journal it will transfer over the value of the item as the current cost value for the acquisition value.
Here is a quick overview.
AX2012 R3 CU11.