Core Data relationship disappears

[Ivan C Myrvold]

I have an Entity named ServiceItem which have a relationship to  
another Entity named Transponder.
I am creating the ServiceItem by looping through a text file, scanning  
for a service item pattern, and create the object with a newObject  
message to an NSArrayController.

 ServiceItem *serviceItem = [oservicesArrayController newObject];
The Transponder entity I have created similarly, and saved into an  
NSDictionary.
Setting the transponder relationship for a ServiceItem, I do:

 Transponder *transponder = [transDict objectForKey:transString];
 [serviceItem setTransponder:transponder];

I can see that the transponder relationship is set in an NSLog:

2009-01-31 16:57:05.596 MyrDream[14520:10b] serviceItem: <ServiceItem:  
0x173086f0> (entity: ServiceItem; id: 0x17308750 <x-coredata:///ServiceItem/t252F7A01-BE3C-4945-B3F3-11FE1CE644892269 
> ; data: {
    channel = nil;
    channelName = "TV 2 Norge";
    package = "Telenor,c:000202,c:01029c,c:020242,c:030202,C:0b00";
    serviceType = 1508;
    serviceTypeString = TV;
    sid = 1508;
    specialFlags = 0;
    transponder = 0x16d3b9f0 <x-coredata:///Transponder/t252F7A01-BE3C-4945-B3F3-11FE1CE64489141 
>;
})

But later on, the transponder relationship have been set to nil, and I  
don't know why. There is probably something missing in my core data  
code.
Do anyone know what I am missing?

2009-01-31 16:57:05.751 MyrDream[14520:10b] makeTransponders 2  
serviceItem: <ServiceItem: 0x173086f0> (entity: ServiceItem; id:  
0x17308750 <x-coredata:///ServiceItem/t252F7A01-BE3C-4945-B3F3-11FE1CE644892269 
> ; data: {
    channel = nil;
    channelName = "TV 2 Norge";
    package = "Telenor,c:000202,c:01029c,c:020242,c:030202,C:0b00";
    serviceType = 1508;
    serviceTypeString = TV;
    sid = 1508;
    specialFlags = 0;
    transponder = nil;
})

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