Error encountered when opening playbooks in the Source to Pay module Issue Errors are occurring when attempting to open playbooks such as 'Cancel a purchase order' in the Source to Pay module. The issue was observed in multiple playbooks and involved errors related to missing activity definitions. The playbook in question is part of the 'Playbooks for Sourcing and Procurement Operations' application. The error was reproducible in the out-of-the-box (OOB) instance during testing. Release Plugin 'Playbooks for Sourcing and Procurement Operations' - 8.5.5 Cause 1. The error occurred due to the playbook being obsolete and no longer used by the application, leading to missing dependencies or configurations in the instance. 2. Observed executions of the playbook in the customer instance were likely manual testing activities, as associated records were in a 'Closed Completed' state rather than 'Cancelled'. Resolution 1. Verify if the playbook in question is still actively used by the application. If it is obsolete, confirm that any observed executions were manually triggered for testing purposes. 2. Ensure that the playbook is not being triggered by out-of-the-box functionality rather than customization.