When inventory is written off via item journal, you can find entries in:
Item Ledger Entries
Value Entries
Warehouse Entries (when applicable)
Entries appear as negative adjustments with a specific Quality Control sample number as the document number/source number reference.
Steps - Check posted quantity in a completed Quality Control activity
Go to the Completed Quality Control Activity List.
Select the appropriate completed Quality Control activity.
Click on the quantity in the Sample Quantity Posted field.
The corresponding item ledger entries open.