Thanks Bastian,
The upgrade to 9.0 is on our schedule in the next few months.
I have tried the "Perform file-system friendly naming" but I am still getting the same results.
I am importing the values to the same system I have exported it from as a test, so importing the ValueMappingKey.xml and ValueMapping.xml should not be necessary.
Do you think deactivating the involved integration packages will make a difference? I have not tried that.
Regards,
Etienne