calling FM SD_STORAGE_LOCATION_DETERMINE in exit MV45AFZZ.
The above is not standard configuration, using exit only we can determine the STL at order level, which was already mentioned by others, and more over you had mentioned only by the below configuration you can achieve the STL at order level does it determine only by below config with out Exit?
the default storage location can be determined using spro > logistics execution > shipping > picking > determine picking location > assign picking locations.
thanks,
Srinu.