[umbrello] [Bug 468728] New: ERD lost foreign keys when loaded again

https://bugs.kde.org/show_bug.cgi?id=468728

            Bug ID: 468728
           Summary: ERD lost foreign keys when loaded again
    Classification: Applications
           Product: umbrello
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

SUMMARY
Lost of foreign keys in ERdiagrams when safed and reloaded.

STEPS TO REPRODUCE
1. Build a ERdiagram with 2 entities (A and B) each with an autoincrment
id-field
2. Add a second record in in Entity for example as "link" as long, unsigned
integer
3. Safe the diagram f.e. as "withoutFk.xmi"
4. Now link entity A as a foreign constaint into B and save as f.e.
"withFk.xmi"
5. Build a diff of both xmi files to see, that the foreigen key was written in
"withFK.xmi"

OBSERVED RESULT
When reload the "withFK.xmi" file all foreign key information is gone.
When safe the file again no info about the foreign key is written - look again
at a diff. 

EXPECTED RESULT
No lost of foreign key information 

SOFTWARE/OS VERSIONS
Linux (Debian testing) with Trinity : 

ADDITIONAL INFORMATION
BTW. export to SQL (only) didn't work so it should not shown.

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