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These numbers help to track individual units or batches of Items which you sell. It also tracks warranty and returns. In case any individual Item is recalled by the supplier the number system helps to track individual Item. The numbering system also manages expiry dates. Please note that if you sell your items in thousands, and if the items are very small like pens or erasers, you need not serialize them. In ERPNext, you will have to mention the serial number in some accounting entries. To create serial numbers you will have to manually create all the numbers in your entries. If your product is not a big consumer durable Item, if it has no warranty and has no chances of being recalled, avoid giving serial numbers.
+> Tip: While entering an item code in an items table, if the table requires inventory details, then depending on whether the entered item is batched or serialized, you can enter serial or batch numbers right away in a pop-up dialog.
+<img alt="Serial No modal" class="screenshot" src="{{docs_base_url}}/assets/img/stock/serial_no_modal.gif"><img alt="Batch No modal" class="screenshot" src="{{docs_base_url}}/assets/img/stock/batch_no_modal.png">
+
> Important: Once you mark an item as serialized or batched or neither, you cannot change it after you have made any stock entry.
* [Discussion on Serialized Inventory]({{docs_base_url}}/user/manual/en/setting-up/stock-reconciliation-for-non-serialized-item.html)
