NSMergeConflict on iOS7

Question

I have updated my app to support iOS 7 and have been faced with the problem that on one of screens in my [context save]; I get the following error:

Answer 1

According to apple's documentation

NSManagedObjectMergeError = 133020

This Error code to denote that a merge policy failed—Core Data is unable to complete merging.

Is there any merge policy in your code? Please try NSMergeByPropertyObjectTrumpMergePolicy.

[self.context setMergePolicy:NSMergeByPropertyObjectTrumpMergePolicy];