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Summary:
When I use fetched property from child managed object context, It causes exception that NSUnknownKeyException. Which reason is '[<_NSObjectID_64_1 0x145cb240> valueForUndefinedKey:]: this class is not key value coding-compliant for the key startDate.'

It seams like $FETCH_SOURCE resolved as NSObjectID. and It causes a exception.

Steps to Reproduce:
1. Create parent NSManagedObjectContext
2. Create child NSMangedObjectContext and set 'parentContext' property to parent NSManagedObjectContext
3. Use fetched property that has predicate with $FETCH_SOURCE

Expected Results:
$FETCH_SOURCE resolves as NSManagedObject and return right fetched property

Actual Results:
$FETCH_SOURCE resolves as NSObjectID and I got a exception and app crashes

Version:
7.1 (11D167)

Notes:
Here is a exception:
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<_NSObjectID_64_1 0x145cb240> valueForUndefinedKey:]: this class is not key value coding-compliant for the key startDate.'
*** First throw call stack:
(0x2edb8f03 0x3954dce7 0x2edb8c09 0x2f779ba3 0x2f6def39 0x2f6dee63 0x2f71d177 0x2f71cd53 0x2f71cb09 0x2f71c8f1 0x2f71be03 0x2eb0a199 0x2eb97df7 0x2eb9856f 0x39a3cb3b 0x39a36d3f 0x39a396c3 0x2ed83679 0x2ed81f45 0x2ecec7a9 0x2ecec58b 0x33c596d3 0x3164b891 0xef8fb 0x39a4bab7)

Configuration:
It occurs always on my iPhone 5, 5s which iOS 7.1 (11D167) installed.
It occurs always on child NSManagedObjectContext.

Attachments: