When doing short pick it's possible to adjust the inventory i.e often to set the on hand to 0 if you do not find the full quantity. Very efficient if we want to make counting a seemless part of in the picking process. But it only works if there's no dimensions below location. It should always work!

https://blogs.msdn.microsoft.com/dynamicsaxscm/2016/11/07/automatic-and-manual-item-reallocation-during-the-short-picking-dynamics-365-for-operations-1611/

"Adjust inventory and adjustment type

Note, if the Adjust Inventory option is selected, all quantity for that the location and the dimensions above the item that is being short picked will be adjusted. This does not apply to items with tracking dimensions that are below the location"