Update an adjustment on a sales order line

Hi All, I have been trying to update an adjustment amount on a sales order at line level, but every time I run the script it gives me an Error but no message, I think I'm missing something, here is  the script

DECLARE

    V_API_VERSION_NUMBER           NUMBER := 1;

    V_RETURN_STATUS                VARCHAR2 (2000);

    V_MSG_COUNT                    NUMBER;

    V_MSG_DATA                     VARCHAR2 (2000);

    -- in variables --

    V_HEADER_REC                   OE_ORDER_PUB.HEADER_REC_TYPE;

    V_LINE_TBL                     OE_ORDER_PUB.LINE_TBL_TYPE;

    V_ACTION_REQUEST_TBL           OE_ORDER_PUB.REQUEST_TBL_TYPE;

    V_LINE_ADJ_TBL                 OE_ORDER_PUB.LINE_ADJ_TBL_TYPE;