SQL problem with error "Invalid data type"

Using SQL 2008

So I created a User Defined type:

CREATE TYPE dbo.ServiceType AS TABLE (
[TO_ZONE] varchar(30) NOT NULL,
[FROM_ZONE] varchar(30) NOT NULL,
[RATE] decimal(14,2) NOT NULL,
[SERVICE_TYPE] varchar(255) NOT NULL
);

And when I try to use it I get the error "parameter or variable @variableName has an invalid data type"

ALTER PROCEDURE [dbo].[ImportServiceTypeRates]

(@ServiceTypes dbo.ServiceType)  --I have tried it without the "dbo." as well

Update

So I added "READONLY" to my variable declaration

@ServiceTypes dbo.ServiceType READONLY

And I now get the error "The parameter @Servicetype cannot be declared READONLY because it is not a table-valued parameter" ?WHAT?

I thought the "CREATE TYPE ServiceType as TABLE" was what declared it such???

I also have showing in Types\User-Defined Table Types\dbo.ServiceType