title: Simple PBFT issue
body: <p>When I use same code with simple-validate and 3 nodes RAFT that are all ok. but I change to BFT. report below error. Actually I only use one un-consume make as input. but not sure why report below error. My code based on M14 version.</p>
  
  <p>[WARN ] 2017-09-26T14:01:38,402Z [Node thread] flow.[9c5ea2df-43ef-4ff8-a954-c6b81ca2740f].run - Flow ended due to receiving exception
  net.corda.core.flows.NotaryException: Error response from Notary - One or more input states for transaction 0EFBAA4B3FAC43D15EB51CD6F7D352C62AC9C5438F56949C50484D1FE38E0A5A have been used in another transaction
      at net.corda.node.services.statemachine.FlowStateMachineImpl.erroredEnd(FlowStateMachineImpl.kt:373) ~[corda-node-0.14.0.jar:?]
      at net.corda.node.services.statemachine.FlowStateMachineImpl.waitForLedgerCommit(FlowStateMachineImpl.kt:212) ~[corda-node-0.14.0.jar:?]
      at net.corda.core.flows.FlowLogic.waitForLedgerCommit(FlowLogic.kt:232) ~[corda-core-0.14.0.jar:?]
      at com.legalcontract.flow.LegalContractFlow$Initiator.call(LegalContractFlow.kt:266) ~[kotlin-source-0.1.jar:?]
      at com.legalcontract.flow.LegalContractFlow$Initiator.call(LegalContractFlow.kt:44) ~[kotlin-source-0.1.jar:?]
      at net.corda.node.services.statemachine.FlowStateMachineImpl.run(FlowStateMachineImpl.kt:101) [corda-node-0.14.0.jar:?]
      at net.corda.node.services.statemachine.FlowStateMachineImpl.run(FlowStateMachineImpl.kt:33) [corda-node-0.14.0.jar:?]
      at co.paralleluniverse.fibers.Fiber.run1(Fiber.java:1067) [quasar-core-0.7.6-jdk8.jar:0.7.6]
      at co.paralleluniverse.fibers.Fiber.exec(Fiber.java:767) [quasar-core-0.7.6-jdk8.jar:0.7.6]
      at co.paralleluniverse.fibers.RunnableFiberTask.doExec(RunnableFiberTask.java:100) [quasar-core-0.7.6-jdk8.jar:0.7.6]
      at co.paralleluniverse.fibers.RunnableFiberTask.run(RunnableFiberTask.java:91) [quasar-core-0.7.6-jdk8.jar:0.7.6]
      at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_144]
      at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_144]
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) [?:1.8.0_144]
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) [?:1.8.0_144]
      at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_144]
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_144]
      at net.corda.node.utilities.AffinityExecutor$ServiceAffinityExecutor$1$thread$1.run(AffinityExecutor.kt:69) [corda-node-0.14.0.jar:?]</p>