Unable to select Resignation Date before system date

Summary

On Submit resignation page - Unable to select Resignation Date before system date

Content

Hi All

Would like to know, will it be possible to select Resignation Date before system date while submit resignation.

  Scenario : 

If an employee resigned on 1^st September but applying online resignation on 13^th Sep. so system should allow him to apply by selecting 1^st Sep. and end date / LWD.  But before system date (Resignation Submit date) unable to select, greyed out

Please refer the screen and suggest.