How to perform a movement reversal:
Find and open the 'Animal Summary' of an animal involved in the movement.
Under 'Events' tap on the movement in question, it will highlight the box in a light grey (do not press on the (i) button).
Press on the circle 'Action Button'.
Select 'Actions'.
Select 'Movement Reversal' from the list.
Select 'Only this Animal' if it just the one record you need to bring back, or 'All Animals'.
Note: Be careful! As selecting all Animals will revert all the records moved within that movement.