Deleting a previous revision of a blog post requires permission as a 'Space Administrator', even with the permission, deletion is not permitted.

Reproduction:

• Create a new blog post
• Make a revision of the post

Expected Behaviour:

• Access 'Tools' > 'Space History'
• Check previous revision
• Select 'Delete'
• Previous revision is added to trash and can either be purged or restored by space administrator

Current Behaviour:

• Access 'Tools' > 'Space History'
• Check previous revision
• Select 'Delete'
• Receive message "Not Permitted, You are not permitted to perform this operation"

Users are unable to delete blog histories and hit into Not Permitted, You are not permitted to perform this operation.

Workaround:
(Available for Confluence Server)

• Delete the page previous versions, and set the current version as "V.1" from the database
• Guide is available from the documentation: How to Remove all Previous Versions of a Page Manually in the Database Using SQL Commands