Approval limits for delegated approvers, approvals posts, and Sites or portal users.
- Approvals in Chatter doesn't support delegated approvers or queues.
- You can't recall or reassign an approval request from a post. Both must be done from the approval record.
- Approval posts can't be deleted in the Salesforce user interface; you can only delete them through the API.
- Approval requests from Sites or portal users aren't supported.