Replicating a "simplenews" node also copies the sent status an nr of people who received the mail

Problem/Motivation

This issue occurs in combination with https://www.drupal.org/project/replicate → .

When a simplenews node is replicated, the sent status and nr of receivers is also copied.
On the newsletter form, you're no longer able to sent the mailing.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes