What are the changes on reversal trasaction when user try G/L reversal, which have Realized Gain or Loss entries in NAV2013 R2?

Dear

I found that there is a change on reversal GL entries in NAV 2013 R2.

When I tried to reverse G/L entries, which have Realized Gain or Loss entries from cust.vend. leger entreis, there is a message as following.

With this message, I cannot proceed the reversal.

I think this is one of changes in NAV 2013.

Do anybody have same problem with me?

Furthur more, I would like to know the backgound why MS add this new logic on NAV 2013.

I am looking foward to have any reply from you.

Thank you.