Relationship to a sub container of a softwareSystem

[Mannshoch]

I try to create a Diagram that show how our systems are connected.

        group "department 1" {
        user = person "user"
}

        group "department 2" {
        
        Vendor = softwareSystem "Vendor"  {
        
              PID = container "PID-CAD"  {
                tags ",CAD"
              }
              Piping = container "Piping"  {
                tags "CAD"
              }
            
            }
       }

Is it possible to create a relationship from user to PID. DSL show me an error if I write user -> PID
I also tried to user -> Vendor.PID