Mask Management Physical Product: How to define a default value?

Hello,

I'm using the Mask Management for Physical Product(VPMReference). In a specific class, there is an attribute defined originally with "has default value = yes". The default value is blank. I would like to change it through the mask (because is not possible to edit a Default Value in widget/web app). Is it possible?

I've tried with: 

"hardwarecode": {
                "mandatory": true,
                "authorized_required": true,
                "defaultValue": "525",
                "authorizedValues": [
                    "525"
                ]
            },

but it doesn't work.

Do you have any tips?

Thank you, Martina

 

FYI: @FP