beginner's question -- RPG400-L

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hi, all
    I want to add records to and update the same file in one of my RPG
program. I used as follow in my F specs.

 FTEST28    UF A E           K DISK

and  I used WRITE to add the records and UPDATE to update the records?

    The compile is passed,  but when I run it, I met the message: '
Attempt to write a duplicate record to file TEST28 (C G D F).'


    What is the problem? Thanks.




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