# How SKUs are generated

<p class="callout danger">Every **product** can have only **one SKU** and every **SKU has to be unique.** D<span data-dobid="hdw">uplicate SKU-s</span> are not supported.</p>

![image.png](https://how-to-erp.dewesoft.com/uploads/images/gallery/2024-05/scaled-1680-/FvNimage.png)

##### **Example:** MME.0038447.11B

In this example, the prefix **MME** stands for **Materials, Metal** (M - Materials, ME - Metal), the number **0038447** means, that this is the 38447th MME product. The suffix **11B** means that the product **revision** is 11B.