Service Ref/namespace question...

All our wcf services share a single business object/data contract library
on the server side this allows all Solutions/projects that are wcf services
to share the business objects they return.
But when the windows client adds wcf service refs they get business
objects/data contracts duplicated across the svc refs and thus a bus obj such
as Order is seen as different because it exists in all svc ref reference.cs
files and thus in diferent namespaces.
Is there an elegant way to combine these business objs across all svc
refs/namespaces? Is this a svcutil thing or does it need to be designed
differently on the server side?

Thanks all.