Show or hide field depending on the content of another field/relation

We only want to display the custom field "latest_delivery_date" in the revenue line items if the product linked in the revenue line item is of the product type "Camera Systems".  In Studio, I can mark the field as dependent and then enter a formula. The syntax "is $product_type("Camera Systems")" does not work because there is probably no "is" function.




Where is the syntax incorrect?
How can I meet this requirement? Any suggestions or ideas are very welcome.

Thanks,
Steffen



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