AS Processing Task

When using the AS processing task with a connection to "an Analysis Services project in this solution", only some processing options are available for processing dimensions. For instance, it is not possible to select "Process Update". Once I change the connection manager to point to the deployed cube database, I can choose from all the options. Is this by design?I have searched the documentation and the net for information on this. I have not been able to find an explanation. Anyone? At all?