via Sage KB:
Items with ~ in the number do not appear on reports.
Note: I believe we'd discussed this before - just found the KB article to link as an FYI/reference.
The correct item number should appear on the report. I tested this in 4.40.0.8, 4.50.4.0 and 5.0 and the issue is in each of these versions. The issue does not exist in 4.20 or 4.30. Also happens in reports generated from sales order and purchase order.
https://partners.sagenorthamerica.com/irj/go/km/docs/sageKM/Sage%20MAS%2090%20and%20200/Gated%20Customers/Warr_Svc_Support%20Plan/110-9000381.xml