Web service, best practice

Hi,
I would need some oppionions on best practices for a WS interface.
Lets say I have a system with 5 different states on an entity, lets say states are A, B, C, D and E. It is not possible to shange from any state to any other state, there are certain rules.
Shall the knowledge on these transition rules be on the service consumer or in the service itself. What I'm looking for is what kind of operations I shall expose:
setState(State aState)
or
changeToStateA()
changeToStateC()
And so on... In the first case all knowlege of state transitions must be on the service consumer. In the second case this is not needed as the operation will take care of that.
Is there any guidelines on this?
Thanks,
Mattias

services should be idempotent and stateless.
that means that transitions and workflow should be the responsibility of the client.
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