As Satya says, you may run into duplicate record problems if the account number is part of the unique key
If this is the case you could create a copy of all records into an outfile, update all those records with the new account number, then add them into your original file
Select * from <pfile> (output to <outfile>)
Update <outfile> set <accountno> = 12345
Insert into <pfile> select * from <outfile>
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