If your system has been set to more than 2 decimal places there will come a time when you have inadvertently entered a payment or receipt with a figure in the third or fourth decimal place.
This will most likely leave you with an inability to finalise your bank reconciliation as in the following example:
To fix it you will need to enter in a new transaction with the amount that you are out (0.0040 in this example)
In the Details / transactions table at the bottom of the page select a new line and on the “Type” field select the drop down box.