How to access or call upon a private service

I am currently making a mashup in ThingWorx 9.6.1-b253, that needs to call upon a few private services from the thing PTC.Nav,ViewPartStructure.

I have tried making a template of that thing and making my own thing inside the same project I am currently doing my work in, as the error states: " Access Modifier Check Failed; Thing: [SMDCostingCalculator] SMDViewPartStructure, accessing ThingTemplate: [ptc.nav.PTC.Nav.Default] PTC.Nav.ViewPartStructureAppThingTemplate Scope: NONE, with Service: GetRepresentableInfo Scope: PRIVATE. Reason: Private Characteristics are accessible only from project in which they're defined." which i can guess is because my thing, SMDViewPartStructure, is not in the service of PTC.Nav.Default.

Is there any workaround to be able to call these services as i need them. I know its possible as my company has another template that calls upon the service in a mashup in another project and seems to work, yet doesnt work when called as a service. 

Below is what i currently have, ive tried it with my thing of the same template and the "official" and neither work. 

Thank you for your time and help, any advice or ideas would be appreciated