Cost Update

Hi

I entered a Supplier invoice, later I change the quantities and Prices basically - I mean, I void Supplier Invoice and PO delivery note and "Decrease" item in PO level - finally FA issued 3 "Cost Update" transactions - repetitive - between Warehouse (debit) C.O.G.S (credit) in same amounts, while it happened in first starting balance in FA that include Bank, Supplier, Customer Balance and some Supplier Invoices with out any Sales Invoice.

I also updated the cost by Standard Costs, but nothing has changed.

as it's obvious these 3 transaction " Cost Update" are increasing inventory amount. Right?

What should I do?