# Why is a Product Name NULL?
A NULL Product Name indicates the SKU exists in *order\_line\_revenue* but does NOT exist in *sku\_attributes*.
{% hint style="success" %}
*order\_line\_revenue* comes from the O**rder Item Data** and *sku\_attributes* comes from the P**roduct Data**. So if you delete a product it won’t join as defined product.
{% endhint %}
If a SKU is missing, Daasity will replace a blank SKU with "tmp12345678901234" and group it up with the NULL (**∅**) sign, **Still Counting Sales for Undefined Product.**
Un-list the merchandise without actually removing it - To Avoid This
### How to Tag Your SKUs
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You must add SKU numbers to your product variants in **Shopify admin for** SKUs to appear as a defined product data, instead of NULL **∅**
{% endhint %}
1. From your **Shopify Admin**, go to **Products** > **All products**.
2. Click on the Product to Edit.
3. For Products with multiple variants, in the **Variants** section, add your SKU numbers:
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For products without variants, in the **Inventory** section, add your SKU number:\
\
4\. Click **Save**.
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After the data is refreshed - SKUs will be defined respectively after the next update.
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