采购合同变更后，审核报错

如题，采购合同 变更后提交，然后审核发生错误，如下是错误堆栈：
错误信息：Server Component wrap a Throwable. Exception Type is [javax.ejb.TransactionRolledbackLocalException]
Caused exception message is: Unexpected system failure, see server log for details.; nested exception is: java.lang.reflect.UndeclaredThrowableException: TxEJB wrap a Not_BaseException while Reflect Invoke ControllerBean. [Client -- String Serialize]
错误详细堆栈信息：com.kingdee.bos.BOSException: Server Component wrap a Throwable. Exception Type is [javax.ejb.TransactionRolledbackLocalException]
Caused exception message is: Unexpected system failure, see server log for details.; nested exception is: java.lang.reflect.UndeclaredThrowableException: TxEJB wrap a Not_BaseException while Reflect Invoke ControllerBean. [Client -- String Serialize]
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:246)
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:324)
at $Proxy295.handleWriteBack(Unknown Source)
at com.kingdee.eas.scm.sm.pur.PurRequest.handleWriteBack(PurRequest.java:298)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.kingdee.bos.ResponseInvocationHandler.invoke(ResponseInvocationHandler.java:194)
at $Proxy294.handleWriteBack(Unknown Source)
at com.kingdee.eas.scm.sm.pur.app.PurContractControllerBean._agreeAlter(PurContractControllerBean.java:921)
at com.kingdee.eas.scm.sm.pur.app.AbstractPurContractControllerBean.agreeAlter(AbstractPurContractControllerBean.java:766)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean.invoke(TxInvokerBean.java:116)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean.INVOKE_REQUIRED(TxInvokerBean.java:57)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean_LocalObjectImpl_2.INVOKE_REQUIRED(Unknown Source)
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:171)
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:324)
at $Proxy410.agreeAlter(Unknown Source)
at com.kingdee.eas.scm.sm.pur.PurContract.agreeAlter(PurContract.java:469)
at rpc_generate._PROXY_com_1_kingdee_1_eas_1_scm_1_sm_1_pur_1_IPurContract.pi45(Unknown Source)
at rpc_generate._PROXY_com_1_kingdee_1_eas_1_scm_1_sm_1_pur_1_IPurContract.processInvoke(Unknown Source)
at com.kingdee.bos.rpc.impl.ObjectProxy.processInvoke(ObjectProxy.java:177)
at com.kingdee.bos.rpc.impl.RPCService.serviceCreateObjectAndInvoke(RPCService.java:611)
at com.kingdee.bos.rpc.impl.RPCService.service(RPCService.java:122)
at com.kingdee.bos.rpc.impl.ServiceDispatcher.run(ServiceDispatcher.java:153)
at com.kingdee.bos.rpc.impl.ThreadJob.run(ThreadJob.java:27)
at com.kingdee.bos.rpc.impl.ThreadPool2$Worker.run(ThreadPool2.java:140)
Caused By: javax.ejb.TransactionRolledbackLocalException
javax.ejb.TransactionRolledbackLocalException: Unexpected system failure, see server log for details.; nested exception is: java.lang.reflect.UndeclaredThrowableException: TxEJB wrap a Not_BaseException while Reflect Invoke ControllerBean.
java.lang.reflect.UndeclaredThrowableException: TxEJB wrap a Not_BaseException while Reflect Invoke ControllerBean.
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean.invoke(TxInvokerBean.java:152)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean.INVOKE_SUPPORTS(TxInvokerBean.java:61)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean_LocalObjectImpl_2.INVOKE_SUPPORTS(Unknown Source)
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:179)
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:324)
at $Proxy295.handleWriteBack(Unknown Source)
at com.kingdee.eas.scm.sm.pur.PurRequest.handleWriteBack(PurRequest.java:298)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.kingdee.bos.ResponseInvocationHandler.invoke(ResponseInvocationHandler.java:194)
at $Proxy294.handleWriteBack(Unknown Source)
at com.kingdee.eas.scm.sm.pur.app.PurContractControllerBean._agreeAlter(PurContractControllerBean.java:921)
at com.kingdee.eas.scm.sm.pur.app.AbstractPurContractControllerBean.agreeAlter(AbstractPurContractControllerBean.java:766)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean.invoke(TxInvokerBean.java:116)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean.INVOKE_REQUIRED(TxInvokerBean.java:57)
at com.kingdee.bos.transaction.EJBTxFacade.TxInvokerBean_LocalObjectImpl_2.INVOKE_REQUIRED(Unknown Source)
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:171)
at com.kingdee.bos.transaction.EJBTransactionProxy.invoke(EJBTransactionProxy.java:324)
at $Proxy410.agreeAlter(Unknown Source)
at com.kingdee.eas.scm.sm.pur.PurContract.agreeAlter(PurContract.java:469)
at rpc_generate._PROXY_com_1_kingdee_1_eas_1_scm_1_sm_1_pur_1_IPurContract.pi45(Unknown Source)
at rpc_generate._PROXY_com_1_kingdee_1_eas_1_scm_1_sm_1_pur_1_IPurContract.processInvoke(Unknown Source)
at com.kingdee.bos.rpc.impl.ObjectProxy.processInvoke(ObjectProxy.java:177)
at com.kingdee.bos.rpc.impl.RPCService.serviceCreateObjectAndInvoke(RPCService.java:611)
at com.kingdee.bos.rpc.impl.RPCService.service(RPCService.java:122)
at com.kingdee.bos.rpc.impl.ServiceDispatcher.run(ServiceDispatcher.java:153)
at com.kingdee.bos.rpc.impl.ThreadJob.run(ThreadJob.java:27)
at com.kingdee.bos.rpc.impl.ThreadPool2$Worker.run(ThreadPool2.java:140)
Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:546)
at java.util.ArrayList.get(ArrayList.java:321)
at com.k