Preventing users from deleting memos

SUGGESTED

Working on Sage 100 v2016 and am trying to allow access to add and modify memos within Customer Maintenance but not to delete the memo.  Under Memo Manager Maintenance I can select either Show, Hide, or Maintain...but, unlike Roles, there isn't a separation between maintain, add, and delete.  We are trying to prevent a user from deleting memos that have been added.