Ubercart cannot get Address line 2 for paypal express

Since I try the paypal express checkout and found that the return value included the address line 2. But ubercart only save the address line 1. It make me cannot ship the product to customer.

The return value:
array(20) {

TOKEN?=> string(20) "EC-4SP58081BR811394R"
TIMESTAMP?=> string(20) "2010-09-10T08:24:57Z"
CORRELATIONID?=> string(13) "598b19186a36f"
ACK?=> string(7) "Success"
VERSION?=> string(3) "3.0"
BUILD?=> string(7) "1500373"
EMAIL?=> string(27) " mhyiu4c@pantarei-design.com"
PAYERID?=> string(13) "HQSH2HUFDM7B8"
PAYERSTATUS?=> string(10) "unverified"
FIRSTNAME?=> string(7) "XXXXX"
LASTNAME?=> string(3) "XXXx"
COUNTRYCODE?=> string(2) "HK"
SHIPTONAME?=> string(11) "XXXXXXXx"
SHIPTOSTREET?=> string(29) "A1 XXXXXXXXXXXX,"
SHIPTOSTREET2?=> string(24) "A2 XXXXXXXXXXx"
SHIPTOCITY?=> string(6) "香港"
SHIPTOCOUNTRYCODE?=> string(2) "HK"
SHIPTOCOUNTRYNAME?=> string(9) "Hong Kong"
ADDRESSSTATUS?=> string(11) "Unconfirmed"
INVNUM?=> string(13) "87-1284107056"

}

I patched and tested to save the address line 2. please help to review.