Tax code updating after new starter form added

I have a client who gave me a number of new starters to add to the system but at the time, didn't have the P45 or HMRC starter form so i put them in with the Unknown tax status. After they were in the client gave me the starter checklists which i added, however the system doesn't auto update the tax code once this is done, you have to go in and manually update it. It would be good if this could be set up to manually update when you add the HMRC status after the employee has been created.