# Reference Values

##### Reference Values and Production Tracking

<span style="color: rgb(45, 194, 107);">**System Configuration&gt; Administration&gt; Reference Values**</span>

**Reference Values** are only used when new items are created or imported **manually** and are **not** created from a document that already has a document number.

Documents such as **Sales Orders** and **Jobs** already have document numbers, so reference values are **not used** for items created from these documents.

For **Invoices in Preparation** and **manually created Job item tracking**, the **Production Tracking number** is used instead.

Unique tracking codes are generated using:

<div id="bkmrk-the-production-track">- the **production tracking code**, and
- the **line ID** from the production tracking table.

</div>**Examples:**

<div id="bkmrk-manually-created-pro">- Manually created production item:  
    `PROT100-354`
- Item created from a document (e.g. Job):  
    `JOB1200-354`

</div>These codes ensure each tracked item can be uniquely identified and traced back to its source.

[![image.png](https://hugeerp10.co.za/hsofmanual/uploads/images/gallery/2026-04/scaled-1680-/TZDimage.png)](https://hugeerp10.co.za/hsofmanual/uploads/images/gallery/2026-04/TZDimage.png)