ToManyMapping saving instances twice

> I'm importing a lot of objects from a plain text file, and for some reason I
> don't understand I'm getting the #items item of my parent object inserted
> twice.
>
> I have the class Route that has many RouteItems.
>
> The importer code got somewhat convoluted, but basically what it does is:
>
> glorpSession inUnitOfWorkDo: [:session |
>        [ stream atEnd ] whileFalse: [
>               route := Route new.
>               session register: route
>               route addItem: RouteItem new.
>        ]
> ].
>
> If I run a simplified version of the above code, it works ok. So the
> mappings are fine.
>
> Something like:
>
> glorpSession inUnitOfWorkDo: [ :session |
> | route |
> route := Route new.
> session register: route.
> route addItem: RouteItem new.
> session register: route.
> route := Route new.
> session register: route.
> route  addItem: RouteItem new.
> ]
>
>
> I can't understand what is causing the duplication of inserts in my "real"
> code.
>
> Any clues?
>
>
> Best regards,
>
>
>
>
>
>
>
>
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