Bogus Retry Option
I found a problem with RPG programs running under Version 2 of OS/400 which were compiled under Version 1. The problem occurs when one of these programs encounters a record lock and issues an RPG1218 message ("unable to allocate record"). The message gives you the option of entering an R to retry.
When you take it, it comes back with an RPG1918 message ("Retry is not supported for programs compiled under Version 1"). At that point, you're forced to cancel the job.
If you are on Version 2 of OS/400, you may want to consider recompiling the RPG programs you compiled under Version 1, in order to prevent this from happening.