Thanks an0malus, I will check this out when I am at home and I will let you know. Since these are rather old props (P6 I presume) it is quite possible the bend attribute is not set properly.
But this doesn't explain why the magnets don't work when I create them manually. The target was V4 which obviously is bendable.
This is weird, I will give it another try this evening too.
I was hoping this was a well known problem with P11.

Yarp - author of P3DO Organizer for Poser