Difference between Material Account and Inventory Valuation Account

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Hi,

I'm not sure about the difference between Material Account and Inventory Valuation Account, both setup in Costing Mapping Set.

In an old post of same title it was explained the following:

"The Inventory Valuation will be picked up at Create Accounting process for the inventory transaction completed and transferred to costing.

I guess it would be same as the Material Account generated at Requisition."

Not really. What I see is that the Inventory Valuation is the only one picked by the Create Accounting process. If it is not defined, the process fails in error, irrespective of the existence of the Material Account defaulted in PO.