Information with different classifications

There will be no problem as long as you ensure all that people who needs to access both, the policy and the related SOP can do that, and they are aware on how to handle the information regarding their respective classification. You should note that ISO 27001 does not prevent this kind of situation, but can help handle related risks.

This article will provide you further explanation about information classification:
- Information classification according to ISO 27001 https://advisera.com/27001academy/blog/2014/05/12/information-classification-according-to-iso-27001/

These materials will also help you regarding information classification:
- Managing ISO Documentation: A Plain English Guide https://advisera.com/books/managing-iso-documentation-plain-english-guide/
- Free online training ISO 27001 Foundations Course https://advisera.com/training/iso-27001-foundations-course/