Enterprise resource planning systems are comprehensive and complex software developed to consolidate business functions and processes. Public entities are encouraged to implement such systems to improve internal process flow and service delivery, despite obvious challenges of the new technology implementation. Elsewhere, many organisations have adopted ERP systems notwithstanding the difficulties and inherent risks. Using data from questionnaires and interviews, this study evaluates the factors that affect the implementation of Microsoft Dynamic 365 ERP systems in public entities in South Africa. The results indicate that the major challenges facing public entities, when it comes to the implementation of big projects, like ERP systems, is the rigid nature of supplier selection processes.