Issue in Maintenance Plan - Key Date

Dear Friends,

I had a Issue in "Maintenance Plan - Key Date".

My Client Requirement is Every month at same date order should be trigerred.

Everything is fine with Key Date till date 28th of any month.

For 29, 30 & 31 we facing problem.....

For Eg:

Call horizon : 90 %

Scheduling period : 1 Yrs

Start of cycle : 30.11.2013

After scheduling

Call Number Plan Date Call Date 1 30.12.2013 27.12.2013 2 30.01.2014 27.01.2014 3 28.02.2014 25.02.2014 4 28.03.2014 25.03.2014 5 28.04.2014 25.04.2014 6 28.05.2014 25.05.2014 7 28.06.2014 25.06.2014 8 28.07.2014 25.07.2014 9 28.08.2014 25.08.2014 10 28.09.2014 25.09.2014 11 28.10.2014 25.10.2014 12 28.11.2014 25.11.2014

My Problem is after February all Plan date comes to 28th of the corresponding months.

What is the solution for this issue???

Regards

Mohan