我遇到了相同的问题， 解决它的步骤是:

I had encountered the same issue, steps to solve it are:

1. 转到此位置:app/code/core/Mage/Sales/etc/config.xml
2. 在app/code/local中复制它的副本:app/code/local/Mage/Sales/etc/config.xml

3. 接下来在第1221行添加msrp

1. Go to this location : app/code/core/Mage/Sales/etc/config.xml
2. Make a copy of it in app/code/local : app/code/local/Mage/Sales/etc/config.xml

3. next on line number 1221 add msrp

<shipping>
   <class>sales/quote_address_total_shipping</class>
   <after>subtotal,freeshipping,tax_subtotal,msrp</after>
   <before>grand_total</before>
</shipping>

<msrp>
   <class>sales/quote_address_total_msrp</class>
   <before>grand_total</before>
</msrp>