Once you enter a start date for a task, you cannot remove it

Once you enter a start date for a task, you cannot remove it

Hi, I think I've found a bug for Zoho Project.

Currently, if you set a start date for a task, you cannot remove it. I mean, you can change it to another start date, but... what if you would like not to have a start date at all for the task?
Currently, it's not possible to return the task to the state it had before you set the start date. :(

Thanks for all your hard work, guys!
Pedro