Dear Kai,
There is a field called as "Cross-Plant Material Status" in Material Master Data - BasicView 1. This field can be customized.
This is Material Master - Basic View 1:
this is the IMG Path: IMG Path: Logistics General -> Material Master -> Settings for Key Fields -> Define Material Statuses.
Here you can create your custom blocking status and customize the blocking type.
Create your custom status and update your materials which you want to block for special cases.
Sincerely,
Beste