when you originally booked the entry you would have posted it as a debit to something and a credit to deferred revenue.  the normal entry at the time the revenue gets "recognized" is to reverse the original entry.  so in other words, you now debit deferred revenue and credit whatever the offsetting code was that you booked to in the first place.

Yes, that is what I thought too.  Unfortunately, this particular company has been re-built twice and I have a sneaking suspicion that the original entry is long gone - the original grant goes back to before the books were even formally kept.  I was hoping there might be a linked account somewhere, but no such luck.  Thanks anyway.

if you run reports->financials->transactions by account

and select the differed revenue account, do you see the initial transaction ?