Can we include assets as covered products in Service Contracts (OKS)?

Customer have both you own equipments and third party equipments (belongs to the enterprise) installed in your site locations.

When an end customer will open a service request, they´d like to see that these equipments (customer products and assets from the enterprise), both covered from a service contract.

To check this out, I´d tried to include asset equipments as covered product into the service contract from OKS module (Author Contracts >  Lines > Pricing / Product > Efectivity > Product Level). However, LOV doesn´t return asset equipments (and it were created several instances in Install Base / Asset Tracking).

Is this the standard functionality (not allow to include assets in service contracts)?