This isn't straightforward because the system deletes fully received and invoiced purchase orders. However, there are a couple of ways you can approach this:
1. If the orders have not yet been deleted, you can go to the Purchase Lines page, filter by Order Type = Order and No. = Your Item No., which will provide a list of orders your item is on.
2. If the orders are already deleted, and you received and invoiced directly from your purchase order, you can go to the Item Ledger Entries to find the posted receipt. Open the posted receipt, and in the Order No. field, you'll find the purchase order number.
3. Another option is to enable purchase order archiving in the Purchases and Receivables Setup page. Once done, you can open the Purchase Line Archive table to find a list of archived purchase order lines. Unfortunately, as far as I know, this table doesn't have a page to open it directly. However, one way is to search and open the Table Information page, filter for the Purchase Line Archive table (5110), and click on the No. of Records field to open it.
Once the table is open, you can filter by Document Type = Order and No. = Your Item No.. This will give you a list of archived purchase orders your item was on.
