Hi Koen, The DatabaseError.CONCURRENT_MODIFICATION <https://developers.google.com/adwords/api/docs/common-errors#DatabaseError.CONCURRENT_MODIFICATION> error that you encountered occurs due to multiple processes that are trying to update the same entity at the same time. It includes a user in the AdWords web interface that is updating the entity while you are updating as well via the API. Could you please confirm that even after waiting for about 30 seconds before retrying the request again, the issue is still occurring? If yes, could you please send to me (via *reply privately to author*) the complete SOAP logs of the operation which returns this error?
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