ABAP RAP: How to call the default function with multiple instance

[#1]

Hi Experts,

I need to add some specify logic to determine default value with multiple instance, only if all selected instances have the same status, then the default value can be determined, otherwise, the value should be empty.
I have added annotation @Former Member.lineItem: [{ type: #FOR_ACTION, dataAction: 'ChangeStatus', invocationGrouping: #CHANGE_SET }] in metadata extensions, I found that all methods are called as a group except the default function.

How could I implement this requirement?

Best Regards,
Wei