Here is the excerpt from the KB document to overcome this issue.
Tuesday, October 19, 2010
One of the most common problem you come across while using Multicurrency module is the Detailed Trial Balance report in GL being out of balance.Microsoft has already published an automated solution for this issue in the partnersource/customersource.
One of the key requirements through out GP users in the Middle East specially Saudi Arabia is to display date in Hijri format.
Just stumbled upon a great post by GP guru Mariano with regards to Hijri conversion customization.Awesome post and sample code.Check it out.