Planned start date should not be earlier than today's date

[NishaB]

Hi, I want one task to be done. In the change record, If I select a planned start date which is earlier than the today's date, then it should not be allowed. How to do this? 

[Mark Manders]

Create the BR with a condition of 'planned start date' at or before today (make it a before BR)

On the actions tab set 'abort action', and add a message: