NSEntityMigrationPolicy subclass methods not being called

I am trying to migrate from one .xcdatamodel file to another. I have a NSEntityMigrationPolicy subclass, the name of which I have entered in xcode-> .xcmappingmodel file -> entity -> "custom Policy" field.

I run my app which successfully opens and runs the previous version of my data so I can only assume basic migration has worked. HOWEVER my NSEntityMigrationPolicy subclass methods are not being called so that I can run further migration code.

@implementation TestMigrationPolicy

- (BOOL)beginEntityMapping:(NSEntityMapping *)mapping manager:(NSMigrationManager *)manager error:(NSError * *)error
{
    NSLog(@"this log is never shown!!!!");
    return YES;
}

Does anyone have any ideas why my it might not be getting called? I am new to core data migration and I'm currently at a loss as to why this is not behaving as I feel it should.

If it helps, I am creating the persistent store like this..

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                         [NSNumber numberWithBool:YES], 
                         NSMigratePersistentStoresAutomaticallyOption,
                         [NSNumber numberWithBool:YES],
                         NSInferMappingModelAutomaticallyOption,
                         nil];


NSError *error = nil;
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
NSLog(@"storeUrl  %@", storeUrl);

if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {

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NSEntityMigrationPolicy subclass methods not being called

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