ExpressCheckout error [handlingamt]

Hello Support Wizard:
There is an open ticket with paypal on this issue. Using 1.3.7 with express.

issue:
No handling fees are assigned in the transaction, [amt] line is writing to [handlingamt] line - causing the 10413 error. PayPal can
Could it be writing the [amt] in the wrong line?

getlineItemdetails 3

LineItemDetails:
Details:Array
(
[AMT] => 55.3
[ITEMAMT] => 0
[HANDLINGAMT] => 55.3
)

thanks

DEFAULT_CURRENCY = USD
SESSION['currency'] = USD
order->info['currency'] = USD
$currencies->currencies[$_SESSION['currency']]['value'] = 1.00000000
currencies Object
(
[observers] => Array
(
)

[currencies] => Array
(
[USD] => Array
(
[title] => US Dollar
[symbol_left] => $
[symbol_right] =>
[decimal_point] => .
[thousands_point] => ,
[decimal_places] => 2
[value] => 1.00000000
)

From reference info I have read [AMT] = "total cost of the order. If shipping and tax are known, include in this value."
We get the total, but the AMT appears to be assigned to the wrong line as [HANDLINGAMT].
Can that be changed in php?
PS. we sell ice cream online, so...
Thanks, lol