I have made a course-backup, including all the scorm modules in the course.

After restoring the course (on an other Moodle environment), everything seems to be in order.
When I start the scorm module, the first (structure) screen appears.
Only when I want to start the module, the system tells me the module is not present.

When I checked, the module is present in the correct directory on disk.
When I hover over the link is says that the module is started with scorm-id=588.
When I check the database, the correct scorm-id = 159