scope for categories in zoho books api

scope for categories in zoho books api

Hello , 

I 've managed to get categories from zoho books (inventory enabled)  with this GET Method

https://books.zoho.com/api/v3/categories?organization_id={}

I use the full access scope and everything works fine. But what is the specific scope for this request?
ZohoBooks.categories.READ does not work.

Best Regards,
G.