As Gilad mentioned in that other thread, the problem with doing it this way when multiple people can have the document opened at the same time is there's now way to guarantee a unique number. You could set it up so that the number is requested from a web server which does the job of coordinating things, but this wouldn't work with Adobe Reader on mobile devices. You might want to move to a different type of code like a timestamp combined with some sort of user identifier. For example: GWJ_20140212163359042.
Oh yeah.... Well this PDF will be located on our server, is that what you are referring to?
A timestamp wouldn't quite work as it does need to be sequential numbering as these will be correlated with our accounts departments.
I just would of thought with carbon copy books being used so much in business, why there is not a easy digital way to do the same thing. It's crazy. I can't be the first person wanting a digital carbon copy style form.
Regarding the server, I was referring to setting up a web server with a script that the form could sumit a request to whenever it needed an new number, not a file server where the PDF resides. The server would check a database and reserve a new number and return it to the form for use. This would require some server programming, but it's the best way to do it. The problem is it won't work with Adobe Reader on mobile devices.
This type of thing is indeed a common thing to want, but it's hard to do from within the document itself since there's no way of knowing what other users are doing. With a physical book or invoice pad, it's not possible to use a number more than once like it is with a multi-user e-form that's not controlled by a server.
Have no idea about a web server....
What if, I had a PDF from for each person, and just give them a different prefix to identify which rep is. Instead of using 'A'. Would the sequetial numbering work then, if the original is save locally?