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Have you had a chance to look at the chapter ' Working with AIA Design Patterns' in the IDG?
I don't know the exact details of your usecase from your post, but I would suggest you to go through some of the design patterns described in detail in the above chapter- 'Guaranteed delivey pattern' in particular.
Let us know if that suits your requirements.
The answer to your question is Yes, a single mediator can invoke two service calls at same time as well.
First, define your service references in the composite.xml
Once you have done that, you can add any number of routing rules for each operation defined in the mediator. In your case, you will need to add two static routing rules within the same operation in the Mediator file. You can also select whether the calls will be sequential or parallel by selecting correct value in the dropdown inside the routing rule. Each routing rule will invoke one service reference in your case.