Hello!
When trying to create a ticket the next error shows:
We can't copy field value from 'RSP' to 'Security Level' field due to a misconfigured workflow post-function. Ensure 'Create issues originally' is executed first.
This only happens with 1 specific value from the RSP field. For example, values A, B , C work correctly no errors but selecting value D is the one showing the above error.
We have checked and the post-function is correct, Security level is configured, so running out of ideas 
Update: Seems the field is bugged, a new one was created "E" and this works. The D field cant even be deleted, cant migrate issues to a different Security level the systems is not allowing me to do any changes on D.
