Open the 
Average Cost Calc. Overview window.
Specifies how the average cost of an item is calculated. This overview provides transparency by allowing you to see the entries that were used to calculate the average cost in each average cost period. The closing entries give you the average cost at the end of each average cost period.
The overview in this window is summarized by valuation date, which is the date the program uses to calculate the average cost by period. There is a summarized closing entry for the end of each average cost period. (You set up the average cost period in the Inventory Setup window). You can expand the closing entry to see all the entries the program used to calculate the average cost in the closing entry.
The Type field tells you what kind of entry it is, and therefore how the program used it in the calculation of the average cost.
When you select an entry and click Navigate, you can view all the documents and entries that relate to the entry in the overview window.
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