getHighestNumberPackagingMaterial method
Implementation
int? getHighestNumberPackagingMaterial(HuDetails? huDetails) {
  final sortedList = huDetails?.toHuItem
      ?.where((item) => item.huItemType == '2' && item.huItemNumber != null)
      .sorted((a, b) => b.huItemNumber!.compareTo(a.huItemNumber!));
  if (sortedList != null && sortedList.isNotEmpty) {
    return sortedList.first.numberPackagingMaterial;
  }
  return null;
}