Hello,
The system will not allow for a particular line (item) to be counted & saved from a stock movement which contains other items. You will have to follow the process as it is.
With that in mind, if you know that a particular item has such an urgent status, you could create a separate stock movement with only that particular item. This way, when the item (and stock movement) is received, you can count, save, and sell it immediately, then come back when the location is less busy to count and save the other created stock movements.
Kind regards,
HansaWorld Global Support