Code is writing to file even when a duplicate record error is returned

What we are trying to do is make sure that a header record is being created
in the CARTHEADER file. Attempts to trap for it not existing cause the
issue below. We have a program that is writing to that file, and checking
for an error.

What we are seeing is records added to the file, but errors are returned to
the program as if it was a duplicate write. We have checked the physical
file, and there are no duplicate key issues we can tell. There are 2
non-unique logical files built over the physical. The physical file is
unique keyed by a dealer number and a unique "Next Cart" number contained in
a control file (VXACONT).

The code reads the control file, adds one to the "Next Cart" number and
updates the control file. It then uses the Next Cart number retrieved to
write a new record to the CARTHEADER file. The "IF %error() and %status() =
01021 " line is causing the code to execute the next DO loop. We see the
records added to the CARTHEADER file in sequential order like;

Dealer Cart Number
001 0001
001 0002
001 0003
001 0004
001 0005
001 0006
001 0007
001 0008
001 0009

The 10th time creates a header, then falls through and allows the program to
use it in the rest of the process.

Our question is: Why is the program receiving or the system throwing a
duplicate key error, even when it writes the record?

Thanks for your thought and help.

Jim

= = = = = = = = = = = = = = = = = =
RPG Code giving us fits;


C Do
10


C 'WPSONLINE ' Chain(e)
XACONTR


C If %error() and %status() >
01000

C
Iter


C
EndIf


C If
%found()


C Clear
CARTHEADR


C Eval OSCART =
XANO01 Next Cart#


C Eval XANO01 = XANO01 +
1


C Update
XACONTR


C Eval CHDEALER =
OSDEALER


C Eval CHCUST = OSCUST


C Eval CHUSER =
OSUSER


C Eval CHCART = OSCART


C Eval CHDESC='Cart created - ' +
%EditC(*date:'Y')

C + ' -
CART2'


C Eval CHSLSMN =
OSSLSMN


C Eval CHCDATE =
*date


C Time
CHCTIME


C Eval CHCUSER =
OSUSER


C Eval CHLDATE =
*date


C Time
CHLTIME


C Eval CHLUSER =
OSUSER


C Write(e)
CARTHEADR


C If %error() and %status() =
01021 Duplicate Rcd Error

C
Iter


C
EndIf


C
EndIf


C EndDo

Unique key for the physical file:

A K CHCUST
A K CHCART

Non-unique key for the logical files:

A K CHCUST
A K CHCART DESCEND

and

A K CHORD (this value is Zero for new records written)