cost of item automatically becomes zero

Summary:

for a finished good item in a PAC organization, its cost becomes zero as seen in the inventory valuation form.
Scenario

*TRANSACTIONS DETAILS*

Work in Process Product Completion = 11765.12

Work in Progress Product return = -1641.51

Intransit Shipment = -8985.93

Movement request issue = -1137.68

NET (on hand) = 0

Opening Quantity = 0

Transaction cost (provided via Cost overrride) = 13,999

how was the PAC calculated and how is it ZERO?

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