SharePoint supports authorization-based document processing with versioning function. In order to edit documents, they must be checked out. After the changes have been made and completed, the documents must be checked in again so that the changes are available to the employees.
A new version is created with each check-in. Old versions can be traced via the version history and restored if necessary.
Further instructions can be found in the relevant literature or in the SharePoint Help menu. If required, you can find instructions for the integrated Quam-supported versioning of the complete system in the manual of the Quam CCM add-on.