while (<DATA>)
  {
  chomp;
  (@fields) = split(/\|/);

  $cat_key = $fields[0];
  $call_seq = $fields[1];
  $copy_num = $fields[2];
  $item_resctl = $fields[3];
  $item_id = $fields[4];
  $num_copies = $fields[5];
  $call_holds = $fields[6];
  $num_reserve_controls = $fields[7];
  $bound_level = $fields[8];
  $callnum = $fields[9];
  $num_callnums = $fields[10];
  $review = $fields[11];
  $cat_acnt = $fields[12];
  $status = $fields[13];
  $copies_on_order = $fields[14];
  $title_holds = $fields[15];
  $title = $fields[16];

  $discard = "YES";

# Added for debugging purposes
  print("Item ID: " . $item_id . "\n");

# Trimmed additional checks and balances for brevity

  if ($discard eq "YES")
    {
# This is the problem child
    printf("%d|%d|%d|%d|%d|%d|%s|\n",$cat_key,$call_seq,$item_id,$copy_num,$num_callnums,$num_copies,$title);
    }
  else
    {
# This line works fine
    print STDERR "$cat_key|$call_seq|$item_id|$copy_num|\n";
    }
  }


__DATA__
111|65|1|0|34211018032711  |1|0|0|NONE|CD ROC SYS|4|0|0|1|0|0|CD1|
611|38|1|0|34211012797211  |1|0|0|NONE|ANF 283.092 SPO|1|0|0|1|0|1|BOOK1|
1011|98|3|0|34211018090411  |4|0|0|NONE|P EDW|11|0|0|1|0|0|BOOK2|
1011|4|2|0|34211011193311  |1|0|0|NONE|ANF 070.43 WIL|1|0|0|1|0|0|BOOK3|
1211|12|1|0|34211014782811  |1|0|0|NONE|ANF 615.3257 MUR|1|0|0|1|0|0|BOOK4|
1212|87|1|0|34211017402911  |1|0|0|NONE|J BLY|6|0|0|1|0|0|BOOK5|
1711|82|1|0|34211016966711  |1|0|0|NONE|P WIL|3|0|0|1|0|0|BOOK6|
2111|5|1|0|34211002936811  |1|0|0|NONE|JNF 981.1 GHE|1|0|0|1|0|1|BOOK7|
2411|27|1|0|34211015588811  |1|0|0|NONE|JNF 597 HAR|2|0|0|1|0|0|BOOK8|
2711|34|1|0|34211016741111  |1|0|0|NONE|AF SAY|2|0|0|1|0|0|BOOK9|