Help to implemenent a service object: return a list of string (will be mapped on destination user) and an integer (will be mapped on slot number)

Hi,

I need to implement a service object that return:

- a list of string corresponding to the destination users for a given activity

- an integer corresponding to the slot number required to complete the destination

I successfully implemented a service object which return a single tuple but here I need a list of tuple AND a single value.

Is it possible to do this?