Check deposited in wrong year

I discovered today part way through recording today's donations that the bishop had accepted a large donation check last year that was not recorded until today. It needs to be on last years donor statement since it could mean as much as $15000 added taxes if it isn't. The bishop clearly got the check four days before the year end. How do I get a check in today's deposit on last year's donation statement?

Normally you do that by making a batch that is dated Dec 31st with just the donations received before the end of the year. However, if you've already deposited the check it's too late to do that. At this point you'll probably have to contact Local Unit Support and ask them to adjust the donation date. There isn't any way to move the donation to a different batch in MLS.