RunReport on an Object GUID

[alext]

I would need to run a RTF template on a specific object within a Repository and not on an entire package.

so for ex. If I have a the following structure MyProject\Use Case Model\My First UC Package\MyFirstUC.
If I want an RTF documentation of "MyFirstUC" I need to pass the package GUID... this will print out all objects under "My First UC Package".
But what if I have several UC in my package ... and I want an RTF document for only one UC... how can I do this from the API??

I know this should be possible since you can print ONE specific object if you run a SQL query that has an "Object_id" in.

Thanks for your help!