Hello,
It is calculated on a FIFO basis. The report shows for each Item the Item Number and Name, the total stock level and the stock level for each ageing period, as defined in the specification window.
More info here:
http://www.hansamanuals.com/main/mailnumber___59819/theconf___512/manuals/version___81/english/hwconvindex.htm?shortcode=HW0303REPORTS_Aged_Stock_Analysis
Regards,
Hansa support