Does redux form field warnings work in Admin on rest inputs?

Question

I am referring to the below documentation,

Tip: The props you pass to <SimpleForm> and <TabbedForm> end up as reduxForm() parameters. This means that, in addition to validate, you can also pass warn or asyncValidate functions. Read the reduxForm() documentation for details.

https://marmelab.com/admin-on-rest/CreateEdit.html#validation

I tried defining warn property at the field level as well as at the form level, but warning text doesn't get displayed. However, I do see the warning property being set correctly in the meta property of that field.

Is this a bug or am I missing something? Thanks

Example (Field level):

const isTest = val => (val === "TEST" ? "Really, TEST?" : undefined);

const PeersCreateEditInputs = (
  <SimpleForm>
    <TextInput source="ln" label="Name" validate={[required]} warn={isTest} />
....

Example (Form level):

const isTest = values => {
  const warnings = {};
  if (values.ln === "TEST") {
    warnings.ln = "Hmm, still TEST?";
  }
  return warnings;
};

const PeersCreateEditInputs = (
  <SimpleForm warn={isTest}>
    <TextInput source="ln" label="Name" validate={[required]} />
...

Answer 1

Found it, the warning is passed but not displayed. I opened an issue on the admin-on-rest repository: https://github.com/marmelab/admin-on-rest/issues/1000