Open URL after combining two Fields

We are moving to a RubyOnRails system and are trying to salvage data from our 20+ year old FMP in-house system.
To achieve this, I created two new Fields in FMP:
One Field contains an url pointing to the RoR web-based system,
The other contains a Product ID
I want the Script to do the following two Steps:
Append the Product ID to the url
Bring up the webpage with the product's details in a new webpage.
When I did a plain Script, the result is that nothing happens.
I must have left out a very basic Step but cannot figure out which one!

Test it manually with the open URL script step. Once it works there you can push it into your code.

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