'Update or set the workflow invocation state action - generic
extension point meant to allows users to interact with interactive
workflow modules. The action object returned from this method will
be attached to the WorkflowInvocationStep and be available the next
time the workflow scheduler visits the workflow.'

def do_invocation_step_action(self, step, action):

    raise exceptions.RequestParameterInvalidException('Attempting    to    perform    invocation    step    action    on    module    that    does    not    support    actions.')
