Benefits Administration - Termination of a plan with a Date Code

I have created a new Date Code (M) that is to terminate a LTD plan based on a date that we have populated within the EE profile screen(ED15).  If ED15 has a date of 12/21/2012 I want to plan to terminate the end of that month.  So I created a date code that is end of month following ED15.  I then added the date code to the Ineligible portion of the plan set up, as well as added it to the Enrolment Parameters and says:

Benefit Status X

Enrollment Status X

Valid Plan Y

Date Code M (M is the new date code that I created)