Can you reference Keyword tests across Projects in a Project Suite?

Is it possible to reference keyword tests between projects in a project suite?

For example, if we had set up our project suite, projects and keyword tests as follows...

Project Suite: MyTestSuite

    Project: FinanceSystemTests

        Keyword Test: SalesInvoiceCreated

    Project: WarehouseSystemTests

        Keyword Test: SalesOrderDespatched

...is it possible to add a Run Keyword Test action in my SalesOrderDespatched keyword test which executes the SalesInvoiceCreated test located in the other project? I've given this a try but the Run Keyword Test popup seems to limit the list to just the current project.