Fixing lost transactions after a split

Q: I was trying to move one of our long-term guests from one site to another using the "Split reservation at this date", but lost all data in the Transactions field.  How do I recover this data?

A: The transactions are probably still there but under the "old" half of the split, which means the wrong linking method was selected when doing the split.  

After confirming that the transactions are in the other half, Delete the reservation that's missing the transactions (under Reservation Details, click "Delete" to completely remove it).  Then correct the dates on the other half to what they were.  This may require undoing a check-out or check-in so the First and Last night can be changed, depending on the situation -- to undo Check-in or Check-out, click on the "Checked in" or "Checked out" box in the Status area of Reservation Details.  Once it's fixed up like it was before, try the Split again.  This time make sure you choose the option marked "Recommended", which is making the first part a sub-member of the 2nd part.