core_v2_blogPost.Update Throwing Error on Valid ID

Has that blog post been moderated?  It looks like you can not update a blog post that has been set to IsApproved = 0 (denied by moderation) in the database.

If that is the case you could check the IsApproved flag on the blog post and not attempt to move posts that have IsApproved false.

The post IsApproved is set to True for this blog post.

BlogId: 433 [number]
GroupId: 728 [number]
IsApproved: true [boolean]
HasPendingChanges: false [boolean]
IsPostEnabled: true [boolean]
IsExternal: false [boolean]
EnableCrossPosting: false [boolean]
IsLocked: false [boolean]

The post IsApproved is set to True for this blog post.

BlogId: 433 [number]
GroupId: 728 [number]
IsApproved: true [boolean]
HasPendingChanges: false [boolean]
IsPostEnabled: true [boolean]
IsExternal: false [boolean]
EnableCrossPosting: false [boolean]
IsLocked: false [boolean]