The instructor is already booked for another class activity for the same period

Summary

Cancelling an ILT and creating a new one

Content

Hello

Having an issue with an ILT that was created incorrectly - so we have end dated it and created a new one. However when trying to add the instructor to the activity on the new offering we receive the error 'The instructor is already booked for another class activity for the same period' - we have even removed the instructor from the previous and changed the offering date of it yet we still can't create the new activity.

Any ideas on this?

Version

20A