Could you please help me with bit more explanation as in what are you trying to achieve. Have you created a Catalog item or Record producer & upon submission of either you want your flow to be triggered. if yes then you don't need to select Record created or updated in the flow trigger section you can just select Service Catalog and in your catalog item/record producer under Process engine tab u can add ur flow under flow field.
ServiceNow does not permit building Flows directly on the sc_req_item table. Instead of this change the triggering to service catalog OR to implement your logic, you can either script it within a Business Rule.
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