WPF - Update Service Reference

When I update the service reference without making any changes to Patterns in Action 4.0_1, it produces 3 error messages (all the same) on Mapper.cs of the WPF Model project.

Error 1 Cannot implicitly convert type 'double' to 'float'. An explicit conversion exists (are you missing a cast?) \WPFModel\DataTransferObjectMapper\Mapper.cs

this occurs on:

order.Freight
orderDetail.Discount
orderDetail.UnitPrice

I am running VS 2010 SP1.  Just curious on how to work around this.  If I don't update the service reference, then it will build and run without errors.

Why would just updating the service reference break the application?