Assembly margin child's Permission Group does not match with Assembly Margin's Permission Group.
The permission group of the Assembly margin child object does not match the permission group of the Assembly Margin object.
Coding or data model propagation errors.
What You Should Do
To repair the object, run the Clean Database custom command (ProgID: SP3DCleanDatabaseCmd.CCheckObj). This command displays a dialog box that lists the objects in error. From the list, you can select the objects and repair them by clicking Clean Now.