Allow role to add a new record but not modify existing records on a connected table

I did try that as well and it didn't work.  I have also tried other logic where a field is completed after the initial entry and it still doesn't fix the issue.  The issue seems to be that it's not carrying the rule from the child table that is being displayed on the parent table.  The user can edit the related child record from the parent table, but they can't edit the record if they are on the child table.