Custom Process Model fails occasionally

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Hi,

We have a custom process that is linked to one of our custom objects create event. Our livechat implemantation is based on Chat Consumer Interface API and we are using a Postchat custom object to store customer responses at post chat survey. When a Postchat survey CO is created it has chat_id and customer responses. We need to report on survey results and since we cannot join CO/Postchat to chats table we are trying to populate the i_id field on CO and join it directly to the incidents table.

CP below is triggered at Postchat