Detailed currency restatements?

I have a customer who runs detailed currency restatements. They create an AR Invoice, post the Invoice and then restate the Invoice, if after the invoice is restated, they go in and change the original GL Distribution, then when the Invoice is restated again, the Voiding Entries are done incorrect in the XA Ledger. The reversing entry is done with the reversed Dollar Amount and new entry with an incorrect account (the same account as the original entry).  When the Invoice is simply Voided as opposed to the GL Distribution being changed, it works fine.  Any thoughts on this?