I am having a problem today that I haven't seen.  When I go into PO-A to look at a purchase order, and click save I get a message saying that a file, ISORDECO is locked by another user.  The users screen says there aren't any other users in  any programs, though there are people signed on.  When I say no and the program exits, it shows me still on PO-A in the users screen.
What is happening here?
 
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Further, when I say close without saving, get back to the lookup menu, and click exit, I get a record lock message for BKAPPO.  The users screen now has me in PO-A two times.