You are using the BPM API to fetch some details from archived process instances. It does not return any value for them, but it works properly for active instances.
You are using something like:
Set<TaskAbstract> abstractTaskSet = taskInstanceManager.getTaskAbstractsByParent(processInstanceURI, taskStatus);
SAP NetWeaver BPM
BPM API, archiving, TaskAbstract , KBA , BC-BMT-BPM-SRV , Process Server , How To
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