Problem with sevDesk (field "product_details")

Problem with sevDesk (field "product_details")

Hello,

I am trying to connect sevDesk with Zoho CRM. The first trigger is supposed to create a module entry (invoice) while fetching an invoice in sevDesk. Unfortunately I am facing issue regarding at least one of the fields. I have no idea which variable to fill in as I don't which information this field is supposed to get. Currently it is "objectName". When testing I receive the following output error:

oho CRM says "Invalid input for Product_Details. The expected input type is jsonarray."
I have searched the forums and it says that one needs to create a custom funtion. As I am not familiar with JavaScript I need advise her.