Costing method used can be stated in the report.

The CIM report only has date range, Category and Location filters as options

The Inventory Valuation report has those and a Summary Only Y/N option

My more important question is in another thread - how to fix unit cost...

The report is attached

How can I tell if these assumed values have totally corrupted my COGS?

I also attached my Valuation Report and it has a lot of wrong numbers.

The unit purchase pricing and reported unit cost are different, some time off by a lot.
How can I correct this?

I assume Unit Cost is used for COGS or Costed BOM for manufactured items.

Tom