Final answer:
The statement that data entered into a system must be correctly reflected in the respective master data is true, as accurate master data is crucial for business operations and decision-making.
Step-by-step explanation:
Data entered into a system must indeed be reflected accurately in the respective master data. Therefore, the statement is true. Master data is a set of core data that is essential to operations in a specific business or business unit. This data is typically non-transactional in nature, but it is critical for understanding and analyzing business operations and for making decisions. Accurate entry of data ensures that the master data remains reliable and that all subsequent operations using this data are based on correct and updated information. This is fundamental for quality assurance, reporting, and for various business processes.