I have added extra fee in the checkout page and save it to the database but when I go to credit memos the extra fee is shown in Credit memo totals but the grand total is not updated
This is my config.xml file
<blocks>
<adminhtml>
<rewrite>
<sales_order_creditmemo_totals>My_Module_Block_Adminhtml_Sales_Order_Creditmemo_Totals</sales_order_creditmemo_totals>
</rewrite>
</adminhtml>
</blocks>