How is Quantity calculated on Inventory Value by Item screen?

Summary:

How is Quantity calculated on Inventory Value by Item screen?

Content (please ensure you mask any confidential information):

If I go to Supply Chain Execution > Cost Accounting > Cost Processing > Review Inventory Valuation

Run a search for the Cost Book and Period, and drill down to Item Details:

What makes up the Quantity?

Things I did to investigate:

I have gone to Supply Chain Execution > Inventory Management > Inventory > Review Completed Transactions:

Search for E10176:

Results:

The Sum on Transaction Quantity = 4

I realise this screen shows a Quantity of -1 for Dec23 so probably doing a simple Sum of Transaction Quantity is not of much use without referring to Transaction Dates / Periods: