CMDB and export of configitems (3.2.7)

[Lamaman]

I run into a problem when using the type 'Customer' in the configitem_definition.

We are using the Import/Export because the search option does not show all needed data/columns in OTRS 3.2.7.
When I try to export information (via Import/Export) in Step 5 of 5 you can select extra search information.
All the columns of the configitem_definition are shown, expect the one of the type 'Customer'.

A kind of strange. I do not hope this is normal behavior, but is there a solution for this?

thank you,
Maurice