Allowing a field to be created but not edited
This may be a simple thing but it has stumped me until now. I wish a user to be able to enter a value in a field but not edit it once it has been entered. ie once a value is entered for an invoice the user needs an administrator to amend the value.
It is a single field within a record set that requires to locked once entered (other than for an administrator) this is a signature field for an operator to confirm they have performed an action.