Benefits: How to make options ineditable after employee submits his enrollment?

Summary:

Hello,

We have the following business requirement for the module Benefits: Refer to below example:

An employee has enrolled in benefit program; and he has chosen his options for a plan(employee plan) and submitted his enrollment. Now, the employee creates a child contact and hence the ‘Add child’ life event is triggered. So, now the employee will proceed to enroll the child as his dependent. So, when the employee is making enrollment for his child; he should not be allowed to edit his previous enrollment made (for employee) plan, like this should be greyed out for him. He should only be able to edit the dependent plan available.