No document requires a number, if that is what you're asking. Probably anything that you print from your software has some sort of report title, right? (Like CompanyZYX Pick List)
So, then, the question becomes what if something changes, and you need to revise your pick list? How do you know that the printed copy that is given to your stocker, or whatever you call him/her, is the current one? All of our sales orders, purchase orders, schedules and on and on are computer generated. We typically go right off the computer for all work, but if a paper copy needs to be generated, it is done just prior to performing the work so that it is "current". If changes are made in the computer there is a change log maintained. So if the paper was printed on 10/13/2003 1030.25 and the computer does not match it at 1537.50 you can review the change logs to see that the a change was made at 1520.30 while the load was put together. In this case we would expect to have change information relayed directly to the loader to inform him of the updates. (our system does not allow changes after the "task" is marked complete, without proper securities and some pre-set steps)
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