This article provides a workaround to replace the deleted workflow.
Similar entries are visible when trying to update the custom resource type:
400 BAD_REQUEST "Cannot retrieve form definition for runnable item RunnableItem [...] Error message: 404 NOT_FOUND "Cannot find workflow with id xxxxxxxxxxxxxxxxxxxxxx"
VMware Aria Orchestrator 8.x
VMware Aria Orchestrator workflow was deleted or replaced with the new one that updated its ID.
To resolve this issue perform the steps: