I Created an emailing Campaign for a Lead's List Mkt into my CRM.

The emailing object is a new Model Message I created.

When I throw the mailing I would see the activities inside the Lead View activities.

The problem is that the Regarding field link the Lead Entity to Commitment Entity, but it isn't present inside the Model Message, I suppose that this is the problem.

I Must add the Regarding field inside the Model Message but it looks like impossible.

How could I solve it so All the Activities are viewing inside the Lead list?