Unable to use RM Transaction Unapply tool in PSTL in Microsoft Dynamics GP

When trying to unapply a receivables payment in history using the RM Transaction Unapply tool in PSTL in Microsoft Dynamics GP, you get this message:

Documents XXXXXXXX Distributinos have realized gain/loss amounts or discount taken amounts or writeoff amounts and is a Multi currency document, and will not be unapplied. 

By design, you cannot unapply sales documents where a gain/loss or discount was booked at the same time the transaction was posted, as further steps would be needed undo that gain/Loss/discount, and you can't simply 'un-apply' it from each other.   Therefore, many multicurrency documents cannot be unapplied using this tool because of that additional action done at the same time it was posted.. 

You would have to manually remove both documents from history, and manually reverse out the GL entries.  Then you would have to rekey the documents back in.   

query words:

MC multicurrency functional multi-currency unapply un-applly applying unapplying un-appling error "RM unapply tool"