Cant update business data modells attribute in the process variables

Lets say i have a business data modell that has person and also puppy. Each object can exist independent from each other, however person have a puppy object, that can be null, it is not mandatory.

I have a process, and a business variable, the type is person. I give the person some data, and an existing puppy object. That means i will have a new line in the person table, and one existing line from the puppy object will be referenced to this line by persistenceId (if i understand this correctly).

404 Error on loading of form and click on Submit Button

Hello, I'm having trouble with the submit form of a button. Nothing happens after the submit button is clicked and I get the following error on the browser console:

"Failed to load:

resource: the server responded with a status of 404."