updating component hierary via API is not working

I have following scenario:
component c1 has 3 subcomponents (c2, c3 and c4)

My Use Case:
I want to replace c2 and c3 components with c5 and c6 components

Current Structure:
Parent component : c1
Child components : c2,c3,c4

Target Structure:
Parent component : c1
Child components : c4,c5,c6

I created a workspace and add c1, c2, c3, c4, c5 components in to workspace. Then I used following method to update the hierarchy inside component c1.

// update component hierarchy
IWorkspaceConnection.updateSubcomponentData(c1Handle, addCompHandleList, removeCompHandleList, null, null);

// create outgoing change set.
IChangeHistorySyncReport changeSetSync = wsWorkspaceConn.compareTo(
                          wsStreamConn, WorkspaceComparisonFlags.CHANGE_SET_COMPARISON_ONLY, Collections.EMPTY_LIST, null);

// delivering change set.
wsWorkspaceConn.deliver(wsStreamConn, changeSetSync, Collections.EMPTY_LIST, changeSetSync.outgoingChangeSets(), null);                        

                        
On delivering change set it threw following exception.

com.ibm.team.scm.common.DeliveryIntroducesConflictsException: CRRTC5042E: Cannot deliver changes since they would create conflicts for item '/.subcomponent_info' in component 'Component 'c1''. Try accepting all incoming changes, resolve the conflicts, then deliver again.at com.ibm.team.scm.service.internal.ScmServiceInternal$2.createException(ScmServiceInternal.java:2834)
at com.ibm.team.scm.service.internal.utils.IExceptionFactory$AbstractExceptionFactory.createException(IExceptionFactory.java:35) at com.ibm.team.scm.service.internal.ScmServiceInternal.deliverCombined(ScmServiceInternal.java:2945)

for you feedback i would be thankful



 

List<IComponentHandle> streamCompHandles = wsStreamConn.getComponents();
for (IComponentHandle streamCompHandle : streamCompHandles ) {
    // add the component to the newly created workspace
    IComponentOp addOperatrion = wsWorkspaceConn.componentOpFactory().addComponent(streamCompHandle, false);
    List operationList = new ArrayList();
    operationList.add(addOperatrion);
    wsWorkspaceConn.applyComponentOperations(operationList, null);
} // for loop

wsStreamConn.getComponents()