Last Reach Last Attempt last meeting boxes grayed out

[JimMason]

How do I input a date here. The boxes are grayed out and I can't manually input a date.

[Roy_Laudenslager]

They are system fields. You can't write to system fields.

[JimMason]

Then how do they get filled in? Where do I input the data?

[Roy_Laudenslager]

You don't, the system records when the corresponding activity is cleared.

[JackDaddy711]

Is it possible to set an Activity Schedule based on the changing of these fields?  For example, I'd like to schedule a follow-up letter when the  "Last Meeting" field is populated.  It doesn't seem possible to define those "grey" fields to trigger an Activity.