src/main/java/com/netflix/imflibrary/st2067_201/IABTrackFileConstraints.java [36:50]:
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        HeaderPartition headerPartition = headerPartitionIMF.getHeaderPartitionOP1A().getHeaderPartition();
        Preface preface = headerPartition.getPreface();
        GenericPackage genericPackage = preface.getContentStorage().getEssenceContainerDataList().get(0).getLinkedPackage();
        SourcePackage filePackage;
        filePackage = (SourcePackage) genericPackage;
        UUID packageID = filePackage.getPackageMaterialNumberasUUID();

        for (TimelineTrack timelineTrack : filePackage.getTimelineTracks()) {
            Sequence sequence = timelineTrack.getSequence();
            if (sequence == null) {
                imfErrorLogger.addError(IMFErrorLogger.IMFErrors.ErrorCodes.IMF_ESSENCE_COMPONENT_ERROR, IMFErrorLogger.IMFErrors.ErrorLevels.NON_FATAL, IMF_IAB_EXCEPTION_PREFIX + String.format("TimelineTrack with instanceUID = %s in the IMFTrackFile represented by ID %s has no sequence.",
                        timelineTrack.getInstanceUID(), packageID.toString()));
            } else {
                GenericDescriptor genericDescriptor = filePackage.getGenericDescriptor();
                if (genericDescriptor instanceof IABEssenceDescriptor) { // Support for st2067-201
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src/main/java/com/netflix/imflibrary/st2067_201/IABTrackFileConstraints.java [214:228]:
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        HeaderPartition headerPartition = headerPartitionIMF.getHeaderPartitionOP1A().getHeaderPartition();
        Preface preface = headerPartition.getPreface();
        GenericPackage genericPackage = preface.getContentStorage().getEssenceContainerDataList().get(0).getLinkedPackage();
        SourcePackage filePackage;
        filePackage = (SourcePackage) genericPackage;
        UUID packageID = filePackage.getPackageMaterialNumberasUUID();

        for (TimelineTrack timelineTrack : filePackage.getTimelineTracks()) {
            Sequence sequence = timelineTrack.getSequence();
            if (sequence == null) {
                imfErrorLogger.addError(IMFErrorLogger.IMFErrors.ErrorCodes.IMF_ESSENCE_COMPONENT_ERROR, IMFErrorLogger.IMFErrors.ErrorLevels.NON_FATAL, IMF_IAB_EXCEPTION_PREFIX + String.format("TimelineTrack with instanceUID = %s in the IMFTrackFile represented by ID %s has no sequence.",
                        timelineTrack.getInstanceUID(), packageID.toString()));
            } else {
                GenericDescriptor genericDescriptor = filePackage.getGenericDescriptor();
                if (genericDescriptor instanceof IABEssenceDescriptor) { // Support for st2067-201
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