How to eliminate "Deferred operation failed" error in on fworkspaceConnection.setFlowTable()?

flowTable.setComponentScopes(workspaceConnection.getResolvedWorkspace(),components);

and I set modified flow table in workspace via below

workspaceConnection.setFlowTable(flowTable, monitor);

com.ibm.team.repository.common.InternalRepositoryException: Deferred operation failed

at com.ibm.team.repository.common.internal.marshal.util.MarshallerUtil.decodeExceptions(MarshallerUtil.java:377)

at com.ibm.team.repository.common.internal.marshal.util.MarshallerUtil.decodeExceptions(MarshallerUtil.java:347)

at com.ibm.team.repository.common.internal.marshal.util.MarshallerUtil.decodeFault(MarshallerUtil.java:312)

at com.ibm.team.repository.transport.client.RemoteTeamService.constructExceptionFromFault(RemoteTeamService.java:717)

at com.ibm.team.repository.transport.client.RemoteTeamService.executeMethod(RemoteTeamService.java:560)

at com.ibm.team.repository.transport.client.RemoteTeamService.invoke(RemoteTeamService.java:202)

at com.ibm.team.repository.transport.client.ServiceInvocationHandler.invoke(ServiceInvocationHandler.java:43)

at com.sun.proxy.$Proxy39.setWorkspaceFlows(Unknown Source)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)

at java.lang.reflect.Method.invoke(Method.java:620)

at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invokeServiceCall(ServiceInterfaceProxy.java:254)

at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invoke(ServiceInterfaceProxy.java:110)

at com.sun.proxy.$Proxy39.setWorkspaceFlows(Unknown Source)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)

at java.lang.reflect.Method.invoke(Method.java:620)

at com.ibm.team.scm.client.internal.ScmServiceInterfaceProxy$2.run(ScmServiceInterfaceProxy.java:170)

at com.ibm.team.repository.client.internal.TeamRepository$3.run(TeamRepository.java:1355)

at com.ibm.team.repository.common.transport.CancelableCaller.call(CancelableCaller.java:79)

at com.ibm.team.repository.client.internal.TeamRepository.callCancelableService(TeamRepository.java:1350)

at com.ibm.team.scm.client.internal.ScmClientLibraryContext.callCancelableService(ScmClientLibraryContext.java:71)

at com.ibm.team.scm.client.internal.ScmServiceInterfaceProxy.invokeCancelableService(ScmServiceInterfaceProxy.java:166)

at com.ibm.team.scm.client.internal.ScmServiceInterfaceProxy.invoke(ScmServiceInterfaceProxy.java:94)

at com.sun.proxy.$Proxy39.setWorkspaceFlows(Unknown Source)

at com.ibm.team.scm.client.internal.FlowNodeConnection.setFlowTable(FlowNodeConnection.java:1713)

at com.ibm.team.scm.client.internal.FlowNodeConnection.setFlowTable(FlowNodeConnection.java:1669)

at com.fca.plugin.flowtarget.business.SetScopeComponentsForFlowTarget.setScopeComponents(SetScopeComponentsForFlowTarget.java:71)

at com.fca.plugin.flowtarget.jobhandler.SetScopeComponentJob.run(SetScopeComponentJob.java:80)

at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

Caused by: com.ibm.team.repository.common.TeamRepositoryException: deferred save failed

... 32 more

Caused by: com.ibm.team.repository.common.InternalRepositoryException: CRJAZ0329E The database query could not be completed. Integrity constraint violation

SQL: INSERT INTO SCM.WORKSPACE_FLOWS(JZ_PARENT_ID, INTERNAL_ID, TARGET_WORKSPACE_ITEM_ID, FLAGS) values (?, ?, ?, ?)

SQL Exception #1

SQL Message: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'WORKSPACE_FLOWS_PK' defined on 'WORKSPACE_FLOWS'.

SQL State: 23505

Error Code: 20000

Class: com.ibm.team.repository.service.internal.dataaccess.write2.HelperRowGenerator$HelperRow

Item Handle: com.ibm.team.scm.common.internal.impl.WorkspaceImpl@755921ca (stateId: [UUID _4_mQ9kvdEem2DuEw1hRQsQ], itemId: [UUID _VriMAEGNEemOm8uacbmTcA], origin: <unset>, immutable: true) (contextId: [UUID _Dp6kMdwTEd2jUupDpQV1Rw], modified: 2019-03-21 19:03:19.615, workingCopy: false) (predecessor: <unset>) (name: PMBD Pilot Dev Workspace, stream: false, description: , time: 4, customContext: [UUID _p57xQODvEd2JvqtXLuqiiw], normalizedName: pmbd pilot dev workspace, readPermissionMode: 0)

... 32 more

Caused by: java.sql.SQLException: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'WORKSPACE_FLOWS_PK' defined on 'WORKSPACE_FLOWS'.

... 32 more