It is never acceptable to manipulate data in this field, so the interviewer could be interested in the way you answer the question in terms of integrity. Your interviewer might also be looking for how you respond to a somewhat stressful question as this touches on ethics and legality issues.
If you spot a documentation error before your inspection, it's essential to bring it to the attention of the appropriate parties as soon as possible. This will allow for the necessary corrections and ensure the inspection is conducted with accurate information. As for manipulating data, it's never acceptable to do so in a fraudulent or unethical manner. However, there may be situations where data needs to be adjusted for legitimate reasons, such as correcting errors or ensuring accuracy. It's important to always approach data manipulation with transparency and integrity, following the company's policies and procedures.