Found shared references to a collection (why?)

[adwin grails]

I got this error message :
error: Found shared references to a collection: Person.relatedPersons



when I tried to save addToRelatedPersons(anotherPerson) :

person.addToRelatedPersons(anotherPerson);
anotherPerson.addToRelatedPersons(person);

anotherPerson.save();
person.save();


my domain :

Person {

 static hasMany = [relatedPersons:Person];

}

any idea why this happens ?


regards

adwin

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