Steps to reproduce

• Have a content type with an attribute having an invert relation and a limitation on it (restrictions.xml, right or workflow).
• The field is filled but disabled, edit the content and save it.
• Invert relations are removed.

Note: Content type course with the attribute courseParts is a good candidate, add the limitation to courseParts through restrictions.xml, so it is editable on first(s) step(s) of pilotage workflow the it is restricted (See ODF-2966 for details on the process).