It would be nice to know that if you are working in a job/order - if someone is working in that same job/order. In case you are doing the same thing or making a change the other user would need to see. (ie: a job is being printed at the same time someone is editing it).
I'd love this as well (as I have lost a lot of work because i forget to hit the save button frequently enough) but I would imagine it would be a substantial undertaking to implement. There are so many occasions where there would need to be a flag since all the modules are very interconnected. Also how would it be handled? If I am in job entry looking at a job does that mean: no one can schedule it, no one can enter time against it, material can't be picked for it, a po can't be received against it, etc. etc. etc.
I'm surprised that error doesn't happen more often than it currently does.
It would be a great universal idea to eliminate the dreaded "this has been updated by another user" and lose all of your work because it can't save the job, SO, PO, etc.
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I don't know if the original user meant just the Job screen or something more general.
The Purchase Order entry screen is one that should be included. It's very frustrating to be adding lines to a PO and then when you try to save, it pops up and says another user is working in the record ( which means nothing can be saved ).