Quality Reports

Answer:

I'm not sure what you mean by Quality Reports and what is the content of this record, but according to clause 8.6 in ISO 9001:2015 that defines requirements for production process, the organization must maintain the following documented information:
- characteristics of the product to be produced or service to be provided
- records about customer property
- production/service provision change control records

If the Quality Report serves to meet one or more of the above mentioned requirements, than it is mandatory to have it. On the other hand, if it is used to monitor or measure some of the parameters in the production process and it is mentioned in the production procedure, than it can also be considered as a mandatory document.

For more information, see: List of mandatory documents required by ISO 9001:2015 https://advisera.com/9001academy/it/knowledgebase/le-cinque-fasi-principali-della-verifica-interna-iso-9001/ ist-of-mandatory-documents-required-by-iso-90012015/

These materials will also help you regarding mandatory documentation:
- Book Discover ISO 9001:2015 Through Practical Examples https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/
- Free online training ISO 9001:2015 Foundations Course https://advisera.com/training/iso-9001-foundations-course/
- Conformio (online tool for ISO 9001) https://advisera.com/conformio/