program message

I've been getting some strange results with a program that works fine on
(that other emulator!)  It has a lot of numeric fields and a subfile.
One field allows the user to select how many lines will change on the
roll.  When I keyed in 00001 (since field exit didn't seem to work well
on that field) then page down, I got a program message that said
starting dump.  Then it put me to "CPF5257 I/O error was detected in
TBD0030 (C G S D F)" where TBD0030 is the DSPF.

Message . . . . :   CPF5257 I/O error was detected in TBD0030 (C G S D
F).
 Cause . . . . . :   The RPG program TBR0030 in library HD1100PO
received the
   message CPF5257 at statement 9300 while doing EXFMT I/O operation on
file
   TBD0030. Actual file is  HD1100PO/TBD0030 MEMBER - *N/A*. See the job
log
   for a complete description of message CPF5257.

I know it's related to the 00001 I keyed in the field, but I'm not
exactly sure why it crashed.  I know now that I keyed too many digits -
the field is defined as 4 digits, keyboard shift numeric.  It may have
been OK if I keyed 0001 (I'll try that.)  If I try on Client Access, it
says "Key used to exit field not valid" or similar message and won't let
me put 5 digits.

I've almost answered my own question.  So the next question is: Can this
be fixed?

(I'm using source from around Oct 14 from CVS)  TIA

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