The most direct way is with a modification. Example being on “Release” of the SO check specific fields. Present errors for those that don’t meet a criteria.
An indirect way using configuration could be to use an approval workflow. Set a filter to trigger when that field is blank and throw a message to the user. This should be a good prompt.
Another ver loose thing is to move all important fields into a specific section of the page. In some cases this needs development though.
If possible you can have that field populated on the customer card. Depends if the customer varies how they have things shipped, but that is generally altered order by order.
