Clean Cart

Delete Table instance is different from select table instance. When do a loop find or assign to a new object, best practice is to use that object's find method.
static void clearDeliveryItems(cusWBWebCartId _cartId)
{
    cusWebCartLine  cusWebCartLine;
    InventTable     inventTable;
    cusWebCartLine  deletecusWebCartLine;
    str             test;
    ;
      _cartId = 'CART_ID_019937';
       while
        select * from cusWebCartLine where cusWebCartLine.cartId == _cartId
        {//test="reset";
            inventTable=inventTable::find(cusWebCartLine.ItemId,false);
                if (inventTable.cusbdDeliveryOption == NoYes::Yes)
                    {
                    ttsbegin;
                    deletecusWebCartLine = cusWebCartLine::findRecId(cusWebCartLine.RecId, true);
                    if (deletecusWebCartLine)
                    {
                        deletecusWebCartLine.delete();
                    }
                    ttscommit;
                   // test="deleted";
                    }
                // else test="safe";
        }
}