The field 'flowPreviousStepId' is missing on MONIT trace 'provideExtFlowStepBegin', and the field 'flowStepId' is set to the value of the step id of the internal provider side. So we are not able to re build the step tree of the flow.
In a business point of view, MONIT traces 'provideFlowStepXXXX' and 'provideExtFlowStepXXX' can be viewed as duplicated. But the MONIT traces aim to flush all stuff required to build the step tree of a flow. The flow monitoring console will be in charge to display the step tree in a business view.