What does ‘Unless otherwise stated’ mean in this context?

When developing a monograph, the rapporteurs may notice that the default peak symmetry requirement (0.8-1.8) is not applicable, necessitating the provision of a specific requirement in the monograph. This approach has been followed by Ph. Eur. expert groups for decades and more than 100 monographs include a different minimum or maximum peak symmetry requirement.

This is further reinforced by the following sentence (see section System suitability): ‘When specific requirements are stated in the monograph, they supersede the requirements mentioned in this chapter.’