Lock Fields

So, I am trying to add a couple of fields as a new section in the Cases Module in SugarmCRM. 

I am trying to make the fields read-only after a User has filled in one of the fields, to prevent anyone to go back and edit it. Field level permissions will restrict access but I want users to have access to it but lock access after the fields have been filled. 

I read somewhere that a Workflow could be created for that

hi haritha raghavan ,

The Workflow engine does not currently have this capability.

The no code solution would be as suggested by Bud Hartley 

Otherwise it can be done with custom code. If you go for this, keep in mind to allow for a reasonable delay, as we know in real life a user sometimes realises they input the wrong value and need to go back to correct it.

hi haritha raghavan ,

The Workflow engine does not currently have this capability.

The no code solution would be as suggested by Bud Hartley 

Otherwise it can be done with custom code. If you go for this, keep in mind to allow for a reasonable delay, as we know in real life a user sometimes realises they input the wrong value and need to go back to correct it.