Hi Hans,

As you suggested, the way to do this is to replace the 
BiddableAdGroupCriterion with a NegativeAdGroupCriterion on the same 
partition. Whenever you want to change the partition tree you must resubmit 
the entire tree 
<https://developers.google.com/adwords/api/docs/guides/shopping#modifying_existing_productpartition_trees>,
 
so the easiest way to construct your AdGroupCriterionService.mutate 
<https://developers.google.com/adwords/api/docs/reference/v201402/AdGroupCriterionService#mutate>
 request 
is to first issue an AdGroupCriterionService.get 
<https://developers.google.com/adwords/api/docs/reference/v201402/AdGroupCriterionService#get>
 request 
to retrieve the existing tree, modify it as needed, and then pass it back 
into the mutate request.

Cheers,
Josh, AdWords API Team

On Wednesday, June 4, 2014 6:03:41 PM UTC-4, HK wrote:
>
> Hi,
>
> I'm looking into changing an existing (leaf) product partition to become 
> excluded (and the other way around). Is the expected approach to doing this 
> to delete the existing BiddableAdGroupCriterion and then create a new 
> NegativeAdGroupCritierion and including the same ProductPartion with the 
> NegativeAdGroupCritierion? If so, is it required to include all the other 
> product partitions in the ad group in the API call to have all the 
> relationships recreated even though I'm must changing a leaf?
>
> Thanks,
> Hans
>

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