Does it required an Inventory Org for expenses Item in i-procurement

Hi All,

We have Inventory Org: A, where the location is attached and assigned location had been selected with 'Ship-to', 'bill-to' and 'office-site' and also the Inventory org is assigned in financial options.

Now we are implementing the i-procurement, where PR-->PO-->PO receipts are done in the i-procurement.

When review the receiving transaction summary, where we need to select the inventory org to view the transaction, where we see the transaction as 'Receiving' and 'Expensing'.

Also we I need the PO create in the Purchase Order form, in shipment form, I do see the Inventory present.

Question:

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1) From where this inventory org is selected in PO for expense items?; we should not be having any inventory org assigned