Where rent templates are set up for monthly billing, with a start date of 29th, 30th or 31st of the month, February presents a problem. 


If the rent is due 29th of the month, the January invoice will be for 39/1 - 27/2

If the rent is due 30th of the month, the January invoice will be for 30/1 - 27/2
If the rent is due 31st of the month, the January invoice will be for 31/1 - 27/2


In all of the above cases the following invoice will be for 28/2 - 27/3, if left undetected this will continue and all future rent invoices will be for 28/.. - 27/.. indefinitely.


To avoid this undesirable billing result users are encouraged to us 'Custom Payment Frequency' settings to stipulate exact due dates for the rents throughout the year.  See Settings menu > Custom Payment Frequencies:


You will need 1 option for each due date that occurs, here's an example based on 31st of the month:


Select this frequency instead of Monthly when setting up rent templates: