During the metadata entry process, a set of four principles were developed to outline and protect the overall standard by which the metadata is being recorded see Poynter and Spiegel (2015) for more details.
The principles of questionnaire documentation are as follows:
...
The most common situation where breaking Principle 4 is valid is when Principles 2 or 3 must be broken. For example, in the situation where it is most appropriate to correct the questionnaire, it is obviously vital to check whether the mistake was intentional or not and if the mistake had a distinct effect on the collected data.
References
Poynter, W. and Spiegel, J. (2015) Protocol Development for Large-Scale Metadata Archiving using DDI-Lifecycle. IASSIST Quarterly, 39, 3, p.23-29.