Hi, The rhsOperand <https://developers.google.com/adwords/api/docs/reference/v201705/CampaignFeedService.FunctionArgumentOperand> while using the IN operator has a limit of 20 ConstantOperands. Please check the documentation <https://developers.google.com/adwords/api/docs/guides/feed-matching-functions#selection_by_feed_item_id> for reference. You will have to make sure that the number of feed item ids that you are setting is 20 or less than that.
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