Shelly1 without N-conductor on One-Way switch

Hello everybody,

I have an issue in order to install my new Shelly 1 in the flat where I`m leaving. The flat is in an old building around 60/70 and is located in Germany. I`m not sure if the cable green-yellow is my N-Conductor (from plug) in order to grab it and insert it in my Shelly.

Can you please help me with this matter?

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I have installed the Shelly and linked the green-yellow cable to N from Shelly, everything is working as designed and expected.