Read-Only For Existing Records property

Use the Read-Only For Existing Records property to specify that a component's value cannot be changed by the user for existing objects in an IDO collection.

Setting Description
True For an existing object, a component's value cannot be changed by the user. The component may be read-write for new objects. This setting prevents the user from modifying a value that should not be changed once an object has been created. The behavior is similar to that of a component bound to a key IDO property.
False Default. For an existing object, a component's value can be changed by the user.