When analyzing changes in a banking system's card authorization module, you found discrepancies in PIN code processing logic between requirements and existing database code. What approach is most effective to resolve this situation?

The most effective approach is to first analyze the business process and contact the responsible personnel from the business unit to clarify requirements and understand the reasons for discrepancies. This will help identify exactly what needs to be implemented: perhaps the requirements are outdated or the code contains fixes not reflected in the documentation. After gaining clarity, a decision can be made about making changes. This approach minimizes the risk of errors and misunderstandings, ensuring alignment between the business and technical implementation.