Before saving a dynamic condition is very important to check the amount of line items that will be affected. What this number means is that the specific amount of products will fall under the condition you are about to create and display the associated ad layout you'll design.
You can check how many line items are affected by the condition at the bottom of the screen, just like shown in the image below:
In order to save the condition, there are two things that must happen:
A minimum of 1 line item needs to be affected
A condition can’t affect the total line items of your feed. For example, if your feed contains a total of 500 line items, a condition must affect up to 499 line items.
Once you save a condition, you can proceed by creating the ad layout associated with the condition.
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