1) Create a site (site a) with an Assignment and have it embedded in a Lesson
2) Create a new site (site b) and copy over the Assignment and Lesson (make sure both these tools are enabled in the new site before trying to Import Site).
3) notice that in site a, the Assignment copied over is in Draft mode, which is expected behavior. What is not expected is that the Draft Assignment shows up in the Lesson.
4) As a student in site a, log in and try taking the assignment. You will see a message as shown in the attachment "error_access_assignment.png".
Tested on Sakai Revision: 309136