brotherton-erpnext/erpnext/docs/user/manual/en/stock/serial-no.md
2017-07-31 16:21:12 +05:30

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# Serial No
As we discussed in the **Item** section, if an **Item** is _serialized_, a
**Serial Number** (Serial No) record is maintained for each quantity of that
**Item**. This information is helpful in tracking the location of the Serial
No, its warranty and end-of-life (expiry) information.
**Serial Nos** are also useful to maintain fixed assets. **Maintenance Schedules** can also be created against serial numbers for planning and scheduling maintenance activity for these assets (if they require maintenance).
You can also track from which **Supplier** you purchased the **Serial No** and
to which **Customer** you have sold it. The **Serial No** status will tell you
its current inventory status.
If your Item is _serialized_ you will have to enter the Serial Nos in the
related column with each Serial No in a new line.
You can maintain single units of serialized items using Serial Number.
### Serial Nos and Inventory
Inventory of an Item can only be affected if the Serial No is transacted via a
Stock transaction (Stock Entry, Purchase Receipt, Delivery Note, Sales
Invoice). When a new Serial No is created directly, its warehouse cannot be
set.
<img class="screenshot" alt="Serial Number" src="{{docs_base_url}}/assets/img/stock/serial-no.png">
* The Status is set based on Stock Entry.
* Only Serial Numbers with status 'Available' can be delivered.
* Serial Nos can automatically be created from a Stock Entry or Purchase Receipt. If you mention Serial No in the Serial Nos column, it will automatically create those serial Nos.
* If in the Item Master, the Serial No Series is mentioned, you can leave the Serial No column blank in a Stock Entry / Purchase Receipt and Serial Nos will automatically be set from that series.
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