Null message in Grails

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I had a domain object

class Project{
    String projectTitle
    Rso rso
}

Where Rso itself is another domain object.

Both projectTitle and rso could not be blank or null.
when I tried
project.projectTitle.blank message in messages.properties, it worked

but
project.rso.null was not working.
I was trying project.rso.null because the default message was mapped as default.null.message.

Then someone suggested me to use
project.rso.nullable and it worked.

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