There might be more options.
I am still unclear about your process. For example:
- Is the correct location on the order before the user receives the goods? If not, why?
- Why is limiting the user from selecting only certain locations help? Do you want to give them the option to select say, between three locations instead of ten? They can still get the location wrong
There might be more options but I need to understand your client's process and why there is such a high risk of getting one field of a document wrong.