Join this hands-on lab for real-world practice modernizing classic on-stack extensions to align with clean core principles in SAP Cloud ERP Private. Learn how to analyze existing custom code, apply the ABAP Cloud development model, and refactor extensions to reduce core modifications while preserving required business logic. Practice governing clean core development using tools such as the ABAP Test Cockpit to identify non-compliant objects and guide remediation decisions. Come away with practical extensibility patterns that complement SAP Fiori development, support side-by-side innovation on SAP BTP, and enable long-term upgradeability in cloud-based SAP landscapes.