PHP PDO ODBC SELECT returns partial results - php

Question

$db_a = new PDO("odbc:MYOB",'user','pass');
foreach($db_a->query("SELECT * FROM Sale WHERE SaleID = 108605") as $row) {
echo '<pre>';
print_r($row);
echo '</pre>';
}
This returns all the table column titles as well as the first five results but everything after that is blank. I've tried issuing the same select statement through MS access and it works correctly
Array
(
[ItemSaleLineID] => 1605696
[0] => 1605696
[SaleLineID] => 1605696
[1] => 1605696
[SaleID] => 108605
[2] => 108605
[LineNumber] => 1
[3] => 1
[LineTypeID] => D
[4] => D
[Description] =>
[5] =>
[TaxExclusiveTotal] =>
[6] =>
[TaxInclusiveTotal] =>
[7] =>
[TaxCodeID] =>
[8] =>
[JobID] =>
[9] =>
[IsMultipleJob] =>
[10] =>
[Quantity] =>
[11] =>
[ItemID] =>
[12] =>
[TaxExclusiveUnitPrice] =>
[13] =>
[TaxInclusiveUnitPrice] =>
[14] =>
[Discount] =>
[15] =>
[CostOfGoodsSoldAmount] =>
[16] =>
[LocationID] =>
[17] =>
[Kit/ComponentIndicator] =>
[18] =>
)
Output from var_dump:
array(20) { ["SaleLineID"]=> string(7) "1605696" [0]=> string(7) "1605696" ["SaleID"]=> string(6) "108605" [1]=> string(6) "108605" ["LineNumber"]=> string(1) "1" [2]=> string(1) "1" ["LineTypeID"]=> string(1) "D" [3]=> string(1) "D" ["Description"]=> NULL [4]=> NULL ["TaxExclusiveAmount"]=> NULL [5]=> NULL ["TaxInclusiveAmount"]=> NULL [6]=> NULL ["TaxCodeID"]=> NULL [7]=> NULL ["JobID"]=> NULL [8]=> NULL ["IsMultipleJob"]=> NULL [9]=> NULL } array(20) { ["SaleLineID"]=> string(7) "1605697" [0]=> string(7) "1605697" ["SaleID"]=> string(6) "108605" [1]=> string(6) "108605" ["LineNumber"]=> string(1) "2" [2]=> string(1) "2" ["LineTypeID"]=> string(1) "D" [3]=> string(1) "D" ["Description"]=> NULL [4]=> NULL ["TaxExclusiveAmount"]=> NULL [5]=> NULL ["TaxInclusiveAmount"]=> NULL [6]=> NULL ["TaxCodeID"]=> NULL [7]=> NULL ["JobID"]=> NULL [8]=> NULL ["IsMultipleJob"]=> NULL [9]=> NULL } array(20) { ["SaleLineID"]=> string(7) "1605698" [0]=> string(7) "1605698" ["SaleID"]=> string(6) "108605" [1]=> string(6) "108605" ["LineNumber"]=> string(1) "3" [2]=> string(1) "3" ["LineTypeID"]=> string(1) "D" [3]=> string(1) "D" ["Description"]=> NULL [4]=> NULL ["TaxExclusiveAmount"]=> NULL [5]=> NULL ["TaxInclusiveAmount"]=> NULL [6]=> NULL ["TaxCodeID"]=> NULL [7]=> NULL ["JobID"]=> NULL [8]=> NULL ["IsMultipleJob"]=> NULL [9]=> NULL }