This is a known issue when using child editing contexts. The only current 
workaround I'm aware of is:

parentEC.setRetainsRegisteredObjects(true);

Ramsey

On Dec 11, 2012, at 1:37 PM, Johnny Miller wrote:

> Hello everyone,
> 
> I'm having problem with a newly deployed app where these errors are popping 
> up intermittently all over the place.
> 
> I was wondering if maybe I could get some advice on whether some things I'm 
> doing are possibly causing this...
> 
> 1.  I'm only using ERXEC 
> 2.  I'm not explicitly using lock or unlock anywhere.
> 3.  I'm creating new EOs with a child EditingContext - I'm going to go to 
> peer editing context in new build but in some cases I just can't do this i.e. 
> the EO is created using a wizard and I don't want to insert the EO unless the 
> user completes the wizard.
> 4.  I'm using EOEditingContext.setDefaultFetchTimestampLag(0) in the 
> application constructor.
> 
> This app has a fair amount of data and a few users who are crunching away on 
> it, constantly adding and updating records.  I set item 4 to 0 because I was 
> worried about users viewing data that is out of sync.
> 
> Could #4 be tripping the error?
> 
> Aloha,
> Mr. Johnny Miller
> Web Development Manager
> Kahalawai Media Company
> Lahaina, HI 96761
> tel: (808) 661-7962 | mobile: (808) 283-0791
> website | e-mail      
> 
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