Hi Shantanu,
There are a couple of things that could went wrong. You can try the following based on the thread i read.
Change your contract:
1) Payment Form - 2. In arrear. Try to use advance in your case. When is your condition period? I suggest you try to use IN ADVANCE for now.
2) You use freq. Start of Calendar Year - so I assume the tenant is paying the Company for one or more years in advance. How often do you bill your tenant and how long is the period? Maybe try to change it to YEAR if you have a contract for period 01/01/2014 to 01/01/02016 and you have to bill your tenant once a year.
Hope it will help.
Kon