Worked on enhancing the reliability and maintainability of SellingSettings within the frappe/erpnext repository, focusing on backend improvements for ERP systems. Addressed a critical bug by introducing defensive checks that verify the existence of the old document before comparing enable_tracking_sales_commissions and enable_utm attributes, thereby preventing runtime errors during configuration creation. This update enabled fixture-driven creation of selling_settings, streamlining deployment processes and improving test coverage across environments. Leveraged Python and the Frappe framework to implement robust, fixture-based testing and PR-driven workflows, ultimately improving data integrity and ensuring smoother configuration rollouts for ERPNext deployments in diverse operational contexts.