How to maintain Planned End date for Project Milestones

Hi Experts,

I have created an Implementation project, assigned a roadmap to it and maintained the Milestones from Solman_Workcenter by setting up Quality Gate Management. Now in the Milestones tab of Solar_Project_Admin there is a column "Planned End Date" but its disbaled. How do I maintain the Planned End Date as there is no option to maintain it even in QGM.

Any help will be highly appreciated.

Thanks & Regards,

Sameer