how maintain the register to ensure it is accurate and current.
This is the fourth data protection principle. Although this principle sounds straightforward, the law recognises that it may not be practical to double-check the accuracy of every item of personal data you receive. So the Act makes special provision about the accuracy of information that individuals provide about themselves, or that is obtained from third parties.
To comply with these provisions you should:
take reasonable steps to ensure the accuracy of any personal data you obtain;
ensure that the source of any personal data is clear;
carefully consider any challenges to the accuracy of information; and
consider whether it is necessary to update the information.