That column is defined as a output only field and hence unless you are open to modifying the screen elements, adding screen flow logic to update the associated tables(Maybe able to accomplish this through implicit enhancements if you are in ECC 6.0), then extract and populate the same back in the order (Should be able to accomplish this through User exit), you might not be able to open up the storage location field for edit.
If all the components of the operation are to be assigned to one storage location, then you could probably configure and use the Operation enhancement to identify the storage location using transaction OPS1, coupled with user exits IWO10015 and IWO10016 for Validations and drop down, then use the user exit (CNEX0027) on the order to auto populate the same.
Regards
Narasimhan
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